mirror of
https://github.com/mjl-/mox.git
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9419ee15dd
similar to greylisting, but not quite the same: with greylisting you would always reject the first delivery attempt with a temporary failure. with the hope that spammers won't retry their deliveries. the spams i've been receiving seem to be quite consistent though. and we would keep rejecting them anyway. we slow down the spammy connections to waste some of the resources of a spammer. this may slow their campaigns down a bit, leaving a bit more time to take measures. we do the same with connections that have their 3rd authentication failure, typically password guess attempts. when we accept a message by a first-time sender, we sleep for 15 seconds before actually delivering them. known-good senders don't have to wait. if the message turns out to be a spammer, at least we've consumed one of their connections, and they cannot deliver at too high a rate to us because of the max open connection limit.
3245 lines
92 KiB
Go
3245 lines
92 KiB
Go
// Package imapserver implements an IMAPv4 server, rev2 (RFC 9051) and rev1 with extensions (RFC 3501 and more).
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package imapserver
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/*
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Implementation notes
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IMAP4rev2 includes functionality that was in extensions for IMAP4rev1. The
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extensions sometimes include features not in IMAP4rev2. We want IMAP4rev1-only
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implementations to use extensions, so we implement the full feature set of the
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extension and announce it as capability. The extensions: LITERAL+, IDLE,
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NAMESPACE, BINARY, UNSELECT, UIDPLUS, ESEARCH, SEARCHRES, SASL-IR, ENABLE,
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LIST-EXTENDED, SPECIAL-USE, MOVE, UTF8=ONLY.
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We take a liberty with UTF8=ONLY. We are supposed to wait for ENABLE of
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UTF8=ACCEPT or IMAP4rev2 before we respond with quoted strings that contain
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non-ASCII UTF-8. But we will unconditionally accept UTF-8 at the moment. See
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../rfc/6855:251
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We always respond with utf8 mailbox names. We do parse utf7 (only in IMAP4rev1,
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not in IMAP4rev2). ../rfc/3501:964
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- We never execute multiple commands at the same time for a connection. We expect a client to open multiple connections instead. ../rfc/9051:1110
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- Do not write output on a connection with an account lock held. Writing can block, a slow client could block account operations.
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- When handling commands that modify the selected mailbox, always check that the mailbox is not opened readonly. And always revalidate the selected mailbox, another session may have deleted the mailbox.
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- After making changes to an account/mailbox/message, you must broadcast changes. You must do this with the account lock held. Otherwise, other later changes (e.g. message deliveries) may be made and broadcast before changes that were made earlier. Make sure to commit changes in the database first, because the commit may fail.
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- Mailbox hierarchies are slash separated, no leading slash. We keep the case, except INBOX is renamed to Inbox, also for submailboxes in INBOX. We don't allow existence of a child where its parent does not exist. We have no \NoInferiors or \NoSelect. Newly created mailboxes are automatically subscribed.
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*/
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/*
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- todo: do not return binary data for a fetch body. at least not for imap4rev1. we should be encoding it as base64?
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- todo: on expunge we currently remove the message even if other sessions still have a reference to the uid. if they try to query the uid, they'll get an error. we could be nicer and only actually remove the message when the last reference has gone. we could add a new flag to store.Message marking the message as expunged, not give new session access to such messages, and make store remove them at startup, and clean them when the last session referencing the session goes. however, it will get much more complicated. renaming messages would need special handling. and should we do the same for removed mailboxes?
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- todo: CONDSTORE, QRESYNC. Add fields modseq on mailbox and each message. Keep (log of) deleted messages and their modseqs.
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- todo: try to recover from syntax errors when the last command line ends with a }, i.e. a literal. we currently abort the entire connection. we may want to read some amount of literal data and continue with a next command.
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- future: more extensions: STATUS=SIZE, OBJECTID, MULTISEARCH, REPLACE, NOTIFY, CATENATE, MULTIAPPEND, SORT, THREAD, CREATE-SPECIAL-USE.
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- future: implement user-defined keyword flags? ../rfc/9051:566
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*/
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import (
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"bufio"
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"bytes"
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"context"
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"crypto/md5"
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"crypto/sha1"
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"crypto/sha256"
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"crypto/tls"
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"encoding/base64"
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"errors"
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"fmt"
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"hash"
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"io"
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"math"
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"net"
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"os"
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"path/filepath"
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"regexp"
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"runtime/debug"
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"sort"
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"strings"
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"time"
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"github.com/prometheus/client_golang/prometheus"
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"github.com/prometheus/client_golang/prometheus/promauto"
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"golang.org/x/text/unicode/norm"
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"github.com/mjl-/bstore"
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"github.com/mjl-/mox/config"
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"github.com/mjl-/mox/message"
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"github.com/mjl-/mox/metrics"
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"github.com/mjl-/mox/mlog"
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"github.com/mjl-/mox/mox-"
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"github.com/mjl-/mox/moxio"
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"github.com/mjl-/mox/moxvar"
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"github.com/mjl-/mox/ratelimit"
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"github.com/mjl-/mox/scram"
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"github.com/mjl-/mox/store"
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)
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// Most logging should be done through conn.log* functions.
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// Only use imaplog in contexts without connection.
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var xlog = mlog.New("imapserver")
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var (
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metricIMAPConnection = promauto.NewCounterVec(
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prometheus.CounterOpts{
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Name: "mox_imap_connection_total",
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Help: "Incoming IMAP connections.",
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},
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[]string{
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"service", // imap, imaps
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},
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)
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metricIMAPCommands = promauto.NewHistogramVec(
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prometheus.HistogramOpts{
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Name: "mox_imap_command_duration_seconds",
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Help: "IMAP command duration and result codes in seconds.",
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Buckets: []float64{0.001, 0.005, 0.01, 0.05, 0.100, 0.5, 1, 5, 10, 20},
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},
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[]string{
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"cmd",
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"result", // ok, panic, ioerror, badsyntax, servererror, usererror, error
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},
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)
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)
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var limiterConnectionrate, limiterConnections *ratelimit.Limiter
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func init() {
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// Also called by tests, so they don't trigger the rate limiter.
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limitersInit()
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}
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func limitersInit() {
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mox.LimitersInit()
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limiterConnectionrate = &ratelimit.Limiter{
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WindowLimits: []ratelimit.WindowLimit{
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{
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Window: time.Minute,
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Limits: [...]int64{300, 900, 2700},
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},
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},
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}
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limiterConnections = &ratelimit.Limiter{
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WindowLimits: []ratelimit.WindowLimit{
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{
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Window: time.Duration(math.MaxInt64), // All of time.
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Limits: [...]int64{30, 90, 270},
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},
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},
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}
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}
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// Delay before reads and after 1-byte writes for probably spammers. Tests set this
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// to zero.
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var badClientDelay = time.Second
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// Capabilities (extensions) the server supports. Connections will add a few more, e.g. STARTTLS, LOGINDISABLED, AUTH=PLAIN.
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// ENABLE: ../rfc/5161
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// LITERAL+: ../rfc/7888
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// IDLE: ../rfc/2177
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// SASL-IR: ../rfc/4959
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// BINARY: ../rfc/3516
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// UNSELECT: ../rfc/3691
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// UIDPLUS: ../rfc/4315
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// ESEARCH: ../rfc/4731
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// SEARCHRES: ../rfc/5182
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// MOVE: ../rfc/6851
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// UTF8=ONLY: ../rfc/6855
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// LIST-EXTENDED: ../rfc/5258
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// SPECIAL-USE: ../rfc/6154
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// LIST-STATUS: ../rfc/5819
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// ID: ../rfc/2971
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// AUTH=SCRAM-SHA-256: ../rfc/7677 ../rfc/5802
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// AUTH=SCRAM-SHA-1: ../rfc/5802
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// AUTH=CRAM-MD5: ../rfc/2195
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// APPENDLIMIT, we support the max possible size, 1<<63 - 1: ../rfc/7889:129
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const serverCapabilities = "IMAP4rev2 IMAP4rev1 ENABLE LITERAL+ IDLE SASL-IR BINARY UNSELECT UIDPLUS ESEARCH SEARCHRES MOVE UTF8=ONLY LIST-EXTENDED SPECIAL-USE LIST-STATUS AUTH=SCRAM-SHA-256 AUTH=SCRAM-SHA-1 AUTH=CRAM-MD5 ID APPENDLIMIT=9223372036854775807"
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type conn struct {
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cid int64
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state state
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conn net.Conn
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tls bool // Whether TLS has been initialized.
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br *bufio.Reader // From remote, with TLS unwrapped in case of TLS.
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line chan lineErr // If set, instead of reading from br, a line is read from this channel. For reading a line in IDLE while also waiting for mailbox/account updates.
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lastLine string // For detecting if syntax error is fatal, i.e. if this ends with a literal. Without crlf.
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bw *bufio.Writer // To remote, with TLS added in case of TLS.
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tr *moxio.TraceReader // Kept to change trace level when reading/writing cmd/auth/data.
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tw *moxio.TraceWriter
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slow bool // If set, reads are done with a 1 second sleep, and writes are done 1 byte at a time, to keep spammers busy.
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lastlog time.Time // For printing time since previous log line.
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tlsConfig *tls.Config // TLS config to use for handshake.
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remoteIP net.IP
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noRequireSTARTTLS bool
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cmd string // Currently executing, for deciding to applyChanges and logging.
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cmdMetric string // Currently executing, for metrics.
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cmdStart time.Time
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log *mlog.Log
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enabled map[capability]bool // All upper-case.
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// Set by SEARCH with SAVE. Can be used by commands accepting a sequence-set with
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// value "$". When used, UIDs must be verified to still exist, because they may
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// have been expunged. Cleared by a SELECT or EXAMINE.
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// Nil means no searchResult is present. An empty list is a valid searchResult,
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// just not matching any messages.
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// ../rfc/5182:13 ../rfc/9051:4040
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searchResult []store.UID
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// Only when authenticated.
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authFailed int // Number of failed auth attempts. For slowing down remote with many failures.
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username string // Full username as used during login.
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account *store.Account
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comm *store.Comm // For sending/receiving changes on mailboxes in account, e.g. from messages incoming on smtp, or another imap client.
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mailboxID int64 // Only for StateSelected.
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readonly bool // If opened mailbox is readonly.
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uids []store.UID // UIDs known in this session, sorted. todo future: store more space-efficiently, as ranges.
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}
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// capability for use with ENABLED and CAPABILITY. We always keep this upper case,
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// e.g. IMAP4REV2. These values are treated case-insensitive, but it's easier for
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// comparison to just always have the same case.
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type capability string
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const (
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capIMAP4rev2 capability = "IMAP4REV2"
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capUTF8Accept capability = "UTF8=ACCEPT"
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)
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type lineErr struct {
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line string
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err error
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}
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type state byte
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const (
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stateNotAuthenticated state = iota
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stateAuthenticated
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stateSelected
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)
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func stateCommands(cmds ...string) map[string]struct{} {
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r := map[string]struct{}{}
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for _, cmd := range cmds {
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r[cmd] = struct{}{}
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}
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return r
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}
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var (
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commandsStateAny = stateCommands("capability", "noop", "logout", "id")
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commandsStateNotAuthenticated = stateCommands("starttls", "authenticate", "login")
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commandsStateAuthenticated = stateCommands("enable", "select", "examine", "create", "delete", "rename", "subscribe", "unsubscribe", "list", "namespace", "status", "append", "idle", "lsub")
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commandsStateSelected = stateCommands("close", "unselect", "expunge", "search", "fetch", "store", "copy", "move", "uid expunge", "uid search", "uid fetch", "uid store", "uid copy", "uid move")
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)
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var commands = map[string]func(c *conn, tag, cmd string, p *parser){
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// Any state.
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"capability": (*conn).cmdCapability,
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"noop": (*conn).cmdNoop,
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"logout": (*conn).cmdLogout,
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"id": (*conn).cmdID,
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// Notauthenticated.
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"starttls": (*conn).cmdStarttls,
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"authenticate": (*conn).cmdAuthenticate,
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"login": (*conn).cmdLogin,
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// Authenticated and selected.
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"enable": (*conn).cmdEnable,
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"select": (*conn).cmdSelect,
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"examine": (*conn).cmdExamine,
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"create": (*conn).cmdCreate,
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"delete": (*conn).cmdDelete,
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"rename": (*conn).cmdRename,
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"subscribe": (*conn).cmdSubscribe,
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"unsubscribe": (*conn).cmdUnsubscribe,
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"list": (*conn).cmdList,
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"lsub": (*conn).cmdLsub,
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"namespace": (*conn).cmdNamespace,
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"status": (*conn).cmdStatus,
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"append": (*conn).cmdAppend,
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"idle": (*conn).cmdIdle,
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// Selected.
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"check": (*conn).cmdCheck,
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"close": (*conn).cmdClose,
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"unselect": (*conn).cmdUnselect,
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"expunge": (*conn).cmdExpunge,
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"uid expunge": (*conn).cmdUIDExpunge,
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"search": (*conn).cmdSearch,
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"uid search": (*conn).cmdUIDSearch,
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"fetch": (*conn).cmdFetch,
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"uid fetch": (*conn).cmdUIDFetch,
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"store": (*conn).cmdStore,
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"uid store": (*conn).cmdUIDStore,
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"copy": (*conn).cmdCopy,
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"uid copy": (*conn).cmdUIDCopy,
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"move": (*conn).cmdMove,
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"uid move": (*conn).cmdUIDMove,
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}
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var errIO = errors.New("fatal io error") // For read/write errors and errors that should close the connection.
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var errProtocol = errors.New("fatal protocol error") // For protocol errors for which a stack trace should be printed.
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var sanityChecks bool
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// check err for sanity.
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// if not nil and checkSanity true (set during tests), then panic. if not nil during normal operation, just log.
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func (c *conn) xsanity(err error, format string, args ...any) {
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if err == nil {
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return
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}
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if sanityChecks {
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panic(fmt.Errorf("%s: %s", fmt.Sprintf(format, args...), err))
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}
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c.log.Errorx(fmt.Sprintf(format, args...), err)
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}
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type msgseq uint32
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// ListenAndServe starts all imap listeners for the configuration, in new goroutines.
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func ListenAndServe() {
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for name, listener := range mox.Conf.Static.Listeners {
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var tlsConfig *tls.Config
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if listener.TLS != nil {
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tlsConfig = listener.TLS.Config
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}
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if listener.IMAP.Enabled {
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port := config.Port(listener.IMAP.Port, 143)
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for _, ip := range listener.IPs {
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go listenServe("imap", name, ip, port, tlsConfig, false, listener.IMAP.NoRequireSTARTTLS)
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}
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}
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if listener.IMAPS.Enabled {
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port := config.Port(listener.IMAPS.Port, 993)
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for _, ip := range listener.IPs {
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go listenServe("imaps", name, ip, port, tlsConfig, true, false)
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}
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}
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}
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}
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func listenServe(protocol, listenerName, ip string, port int, tlsConfig *tls.Config, xtls, noRequireSTARTTLS bool) {
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addr := net.JoinHostPort(ip, fmt.Sprintf("%d", port))
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xlog.Print("listening for imap", mlog.Field("listener", listenerName), mlog.Field("addr", addr), mlog.Field("protocol", protocol))
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network := mox.Network(ip)
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var ln net.Listener
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var err error
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|
if xtls {
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ln, err = tls.Listen(network, addr, tlsConfig)
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|
} else {
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ln, err = net.Listen(network, addr)
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}
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if err != nil {
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xlog.Fatalx("imap: listen for imap"+mox.LinuxSetcapHint(err), err, mlog.Field("protocol", protocol), mlog.Field("listener", listenerName))
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}
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for {
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conn, err := ln.Accept()
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|
if err != nil {
|
|
xlog.Infox("imap: accept", err, mlog.Field("protocol", protocol), mlog.Field("listener", listenerName))
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|
continue
|
|
}
|
|
|
|
metricIMAPConnection.WithLabelValues(protocol).Inc()
|
|
go serve(listenerName, mox.Cid(), tlsConfig, conn, xtls, noRequireSTARTTLS)
|
|
}
|
|
}
|
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|
|
// returns whether this connection accepts utf-8 in strings.
|
|
func (c *conn) utf8strings() bool {
|
|
return c.enabled[capIMAP4rev2] || c.enabled[capUTF8Accept]
|
|
}
|
|
|
|
func (c *conn) xdbwrite(fn func(tx *bstore.Tx)) {
|
|
err := c.account.DB.Write(func(tx *bstore.Tx) error {
|
|
fn(tx)
|
|
return nil
|
|
})
|
|
xcheckf(err, "transaction")
|
|
}
|
|
|
|
func (c *conn) xdbread(fn func(tx *bstore.Tx)) {
|
|
err := c.account.DB.Read(func(tx *bstore.Tx) error {
|
|
fn(tx)
|
|
return nil
|
|
})
|
|
xcheckf(err, "transaction")
|
|
}
|
|
|
|
// Closes the currently selected/active mailbox, setting state from selected to authenticated.
|
|
// Does not remove messages marked for deletion.
|
|
func (c *conn) unselect() {
|
|
if c.state == stateSelected {
|
|
c.state = stateAuthenticated
|
|
}
|
|
c.mailboxID = 0
|
|
c.uids = nil
|
|
}
|
|
|
|
func (c *conn) setSlow(on bool) {
|
|
if on && !c.slow {
|
|
c.log.Debug("connection changed to slow")
|
|
} else if !on && c.slow {
|
|
c.log.Debug("connection restored to regular pace")
|
|
}
|
|
c.slow = on
|
|
}
|
|
|
|
// Write makes a connection an io.Writer. It panics for i/o errors. These errors
|
|
// are handled in the connection command loop.
|
|
func (c *conn) Write(buf []byte) (int, error) {
|
|
chunk := len(buf)
|
|
if c.slow {
|
|
chunk = 1
|
|
}
|
|
|
|
var n int
|
|
for len(buf) > 0 {
|
|
if err := c.conn.SetWriteDeadline(time.Now().Add(30 * time.Second)); err != nil {
|
|
c.log.Errorx("setting write deadline", err)
|
|
}
|
|
|
|
nn, err := c.conn.Write(buf[:chunk])
|
|
if err != nil {
|
|
panic(fmt.Errorf("write: %s (%w)", err, errIO))
|
|
}
|
|
n += nn
|
|
buf = buf[chunk:]
|
|
if len(buf) > 0 && badClientDelay > 0 {
|
|
mox.Sleep(mox.Context, badClientDelay)
|
|
}
|
|
}
|
|
return n, nil
|
|
}
|
|
|
|
func (c *conn) xtrace(level mlog.Level) func() {
|
|
c.xflush()
|
|
c.tr.SetTrace(level)
|
|
c.tw.SetTrace(level)
|
|
return func() {
|
|
c.xflush()
|
|
c.tr.SetTrace(mlog.LevelTrace)
|
|
c.tw.SetTrace(mlog.LevelTrace)
|
|
}
|
|
}
|
|
|
|
// Cache of line buffers for reading commands.
|
|
var bufpool = moxio.NewBufpool(8, 16*1024)
|
|
|
|
// read line from connection, not going through line channel.
|
|
func (c *conn) readline0() (string, error) {
|
|
if c.slow && badClientDelay > 0 {
|
|
mox.Sleep(mox.Context, badClientDelay)
|
|
}
|
|
|
|
d := 30 * time.Minute
|
|
if c.state == stateNotAuthenticated {
|
|
d = 30 * time.Second
|
|
}
|
|
c.conn.SetReadDeadline(time.Now().Add(d))
|
|
|
|
line, err := bufpool.Readline(c.br)
|
|
if err != nil && errors.Is(err, moxio.ErrLineTooLong) {
|
|
return "", fmt.Errorf("%s (%w)", err, errProtocol)
|
|
} else if err != nil {
|
|
return "", fmt.Errorf("%s (%w)", err, errIO)
|
|
}
|
|
return line, nil
|
|
}
|
|
|
|
func (c *conn) lineChan() chan lineErr {
|
|
if c.line == nil {
|
|
c.line = make(chan lineErr, 1)
|
|
go func() {
|
|
line, err := c.readline0()
|
|
c.line <- lineErr{line, err}
|
|
}()
|
|
}
|
|
return c.line
|
|
}
|
|
|
|
// readline from either the c.line channel, or otherwise read from connection.
|
|
func (c *conn) readline(readCmd bool) string {
|
|
var line string
|
|
var err error
|
|
if c.line != nil {
|
|
le := <-c.line
|
|
c.line = nil
|
|
line, err = le.line, le.err
|
|
} else {
|
|
line, err = c.readline0()
|
|
}
|
|
if err != nil {
|
|
if readCmd && errors.Is(err, os.ErrDeadlineExceeded) {
|
|
c.conn.SetWriteDeadline(time.Now().Add(10 * time.Second))
|
|
c.writelinef("* BYE inactive")
|
|
}
|
|
if !errors.Is(err, errIO) && !errors.Is(err, errProtocol) {
|
|
err = fmt.Errorf("%s (%w)", err, errIO)
|
|
}
|
|
panic(err)
|
|
}
|
|
c.lastLine = line
|
|
|
|
// We typically respond immediately (IDLE is an exception).
|
|
// The client may not be reading, or may have disappeared.
|
|
// Don't wait more than 5 minutes before closing down the connection.
|
|
// The write deadline is managed in IDLE as well.
|
|
// For unauthenticated connections, we require the client to read faster.
|
|
wd := 5 * time.Minute
|
|
if c.state == stateNotAuthenticated {
|
|
wd = 30 * time.Second
|
|
}
|
|
c.conn.SetWriteDeadline(time.Now().Add(wd))
|
|
|
|
return line
|
|
}
|
|
|
|
// write tagged command response, but first write pending changes.
|
|
func (c *conn) writeresultf(format string, args ...any) {
|
|
c.bwriteresultf(format, args...)
|
|
c.xflush()
|
|
}
|
|
|
|
// write buffered taggedcommand response, but first write pending changes.
|
|
func (c *conn) bwriteresultf(format string, args ...any) {
|
|
switch c.cmd {
|
|
case "fetch", "store", "search":
|
|
// ../rfc/9051:5862
|
|
default:
|
|
if c.comm != nil {
|
|
c.applyChanges(c.comm.Get(), false)
|
|
}
|
|
}
|
|
c.bwritelinef(format, args...)
|
|
}
|
|
|
|
func (c *conn) writelinef(format string, args ...any) {
|
|
c.bwritelinef(format, args...)
|
|
c.xflush()
|
|
}
|
|
|
|
// Buffer line for write.
|
|
func (c *conn) bwritelinef(format string, args ...any) {
|
|
format += "\r\n"
|
|
fmt.Fprintf(c.bw, format, args...)
|
|
}
|
|
|
|
func (c *conn) xflush() {
|
|
err := c.bw.Flush()
|
|
xcheckf(err, "flush") // Should never happen, the Write caused by the Flush should panic on i/o error.
|
|
}
|
|
|
|
func (c *conn) readCommand(tag *string) (cmd string, p *parser) {
|
|
line := c.readline(true)
|
|
p = newParser(line, c)
|
|
p.context("tag")
|
|
*tag = p.xtag()
|
|
p.context("command")
|
|
p.xspace()
|
|
cmd = p.xcommand()
|
|
return cmd, newParser(p.remainder(), c)
|
|
}
|
|
|
|
func (c *conn) xreadliteral(size int64, sync bool) string {
|
|
if sync {
|
|
c.writelinef("+")
|
|
}
|
|
buf := make([]byte, size)
|
|
if size > 0 {
|
|
if err := c.conn.SetReadDeadline(time.Now().Add(30 * time.Second)); err != nil {
|
|
c.log.Errorx("setting read deadline", err)
|
|
}
|
|
|
|
_, err := io.ReadFull(c.br, buf)
|
|
if err != nil {
|
|
// Cannot use xcheckf due to %w handling of errIO.
|
|
panic(fmt.Errorf("reading literal: %s (%w)", err, errIO))
|
|
}
|
|
}
|
|
return string(buf)
|
|
}
|
|
|
|
var cleanClose struct{} // Sentinel value for panic/recover indicating clean close of connection.
|
|
|
|
func serve(listenerName string, cid int64, tlsConfig *tls.Config, nc net.Conn, xtls, noRequireSTARTTLS bool) {
|
|
var remoteIP net.IP
|
|
if a, ok := nc.RemoteAddr().(*net.TCPAddr); ok {
|
|
remoteIP = a.IP
|
|
} else {
|
|
// For net.Pipe, during tests.
|
|
remoteIP = net.ParseIP("127.0.0.10")
|
|
}
|
|
|
|
c := &conn{
|
|
cid: cid,
|
|
conn: nc,
|
|
tls: xtls,
|
|
lastlog: time.Now(),
|
|
tlsConfig: tlsConfig,
|
|
remoteIP: remoteIP,
|
|
noRequireSTARTTLS: noRequireSTARTTLS,
|
|
enabled: map[capability]bool{},
|
|
cmd: "(greeting)",
|
|
cmdStart: time.Now(),
|
|
}
|
|
c.log = xlog.MoreFields(func() []mlog.Pair {
|
|
now := time.Now()
|
|
l := []mlog.Pair{
|
|
mlog.Field("cid", c.cid),
|
|
mlog.Field("delta", now.Sub(c.lastlog)),
|
|
}
|
|
c.lastlog = now
|
|
if c.username != "" {
|
|
l = append(l, mlog.Field("username", c.username))
|
|
}
|
|
return l
|
|
})
|
|
c.tr = moxio.NewTraceReader(c.log, "C: ", c.conn)
|
|
c.tw = moxio.NewTraceWriter(c.log, "S: ", c)
|
|
c.br = bufio.NewReader(c.tr)
|
|
c.bw = bufio.NewWriter(c.tw)
|
|
|
|
// Many IMAP connections use IDLE to wait for new incoming messages. We'll enable
|
|
// keepalive to get a higher chance of the connection staying alive, or otherwise
|
|
// detecting broken connections early.
|
|
xconn := c.conn
|
|
if xtls {
|
|
xconn = c.conn.(*tls.Conn).NetConn()
|
|
}
|
|
if tcpconn, ok := xconn.(*net.TCPConn); ok {
|
|
if err := tcpconn.SetKeepAlivePeriod(5 * time.Minute); err != nil {
|
|
c.log.Errorx("setting keepalive period", err)
|
|
} else if err := tcpconn.SetKeepAlive(true); err != nil {
|
|
c.log.Errorx("enabling keepalive", err)
|
|
}
|
|
}
|
|
|
|
c.log.Info("new connection", mlog.Field("remote", c.conn.RemoteAddr()), mlog.Field("local", c.conn.LocalAddr()), mlog.Field("tls", xtls), mlog.Field("listener", listenerName))
|
|
|
|
defer func() {
|
|
c.conn.Close()
|
|
|
|
if c.account != nil {
|
|
c.comm.Unregister()
|
|
err := c.account.Close()
|
|
c.xsanity(err, "close account")
|
|
c.account = nil
|
|
c.comm = nil
|
|
}
|
|
|
|
x := recover()
|
|
if x == nil || x == cleanClose {
|
|
c.log.Info("connection closed")
|
|
} else if err, ok := x.(error); ok || isClosed(err) {
|
|
c.log.Infox("connection closed", err)
|
|
} else {
|
|
c.log.Error("unhandled error", mlog.Field("err", x))
|
|
debug.PrintStack()
|
|
metrics.PanicInc("imapserver")
|
|
}
|
|
}()
|
|
|
|
select {
|
|
case <-mox.Shutdown:
|
|
// ../rfc/9051:5381
|
|
c.writelinef("* BYE mox shutting down")
|
|
panic(errIO)
|
|
default:
|
|
}
|
|
|
|
if !limiterConnectionrate.Add(c.remoteIP, time.Now(), 1) {
|
|
c.writelinef("* BYE connection rate from your ip or network too high, slow down please")
|
|
return
|
|
}
|
|
|
|
// If remote IP/network resulted in too many authentication failures, refuse to serve.
|
|
if !mox.LimiterFailedAuth.CanAdd(c.remoteIP, time.Now(), 1) {
|
|
c.log.Debug("refusing connection due to many auth failures", mlog.Field("remoteip", c.remoteIP))
|
|
c.writelinef("* BYE too many auth failures")
|
|
return
|
|
}
|
|
|
|
if !limiterConnections.Add(c.remoteIP, time.Now(), 1) {
|
|
c.log.Debug("refusing connection due to many open connections", mlog.Field("remoteip", c.remoteIP))
|
|
c.writelinef("* BYE too many open connections from your ip or network")
|
|
return
|
|
}
|
|
defer limiterConnections.Add(c.remoteIP, time.Now(), -1)
|
|
|
|
// We register and unregister the original connection, in case it c.conn is
|
|
// replaced with a TLS connection later on.
|
|
mox.Connections.Register(nc, "imap", listenerName)
|
|
defer mox.Connections.Unregister(nc)
|
|
|
|
c.writelinef("* OK [CAPABILITY %s] mox imap", c.capabilities())
|
|
|
|
for {
|
|
c.command()
|
|
c.xflush() // For flushing errors, or possibly commands that did not flush explicitly.
|
|
}
|
|
}
|
|
|
|
// isClosed returns whether i/o failed, typically because the connection is closed.
|
|
// For connection errors, we often want to generate fewer logs.
|
|
func isClosed(err error) bool {
|
|
return errors.Is(err, errIO) || errors.Is(err, errProtocol) || moxio.IsClosed(err)
|
|
}
|
|
|
|
func (c *conn) command() {
|
|
var tag, cmd, cmdlow string
|
|
var p *parser
|
|
|
|
defer func() {
|
|
var result string
|
|
defer func() {
|
|
metricIMAPCommands.WithLabelValues(c.cmdMetric, result).Observe(float64(time.Since(c.cmdStart)) / float64(time.Second))
|
|
}()
|
|
|
|
logFields := []mlog.Pair{
|
|
mlog.Field("cmd", c.cmd),
|
|
mlog.Field("duration", time.Since(c.cmdStart)),
|
|
}
|
|
c.cmd = ""
|
|
|
|
x := recover()
|
|
if x == nil || x == cleanClose {
|
|
c.log.Debug("imap command done", logFields...)
|
|
result = "ok"
|
|
return
|
|
}
|
|
err, ok := x.(error)
|
|
if !ok {
|
|
c.log.Error("imap command panic", append([]mlog.Pair{mlog.Field("panic", x)}, logFields...)...)
|
|
result = "panic"
|
|
panic(x)
|
|
}
|
|
|
|
if isClosed(err) {
|
|
c.log.Infox("imap command ioerror", err, logFields...)
|
|
result = "ioerror"
|
|
if errors.Is(err, errProtocol) {
|
|
debug.PrintStack()
|
|
}
|
|
panic(err)
|
|
}
|
|
|
|
var sxerr syntaxError
|
|
var uerr userError
|
|
var serr serverError
|
|
if errors.As(err, &sxerr) {
|
|
result = "badsyntax"
|
|
c.log.Debugx("imap command syntax error", err, logFields...)
|
|
c.log.Info("imap syntax error", mlog.Field("lastline", c.lastLine))
|
|
fatal := strings.HasSuffix(c.lastLine, "+}")
|
|
if fatal {
|
|
c.conn.SetWriteDeadline(time.Now().Add(5 * time.Second))
|
|
}
|
|
c.bwriteresultf("%s BAD %s unrecognized syntax/command: %v", tag, cmd, err)
|
|
if fatal {
|
|
c.xflush()
|
|
panic(fmt.Errorf("aborting connection after syntax error for command with non-sync literal: %w", errProtocol))
|
|
}
|
|
} else if errors.As(err, &serr) {
|
|
result = "servererror"
|
|
c.log.Errorx("imap command server error", err, logFields...)
|
|
debug.PrintStack()
|
|
c.bwriteresultf("%s NO %s %v", tag, cmd, err)
|
|
} else if errors.As(err, &uerr) {
|
|
result = "usererror"
|
|
c.log.Debugx("imap command user error", err, logFields...)
|
|
if uerr.code != "" {
|
|
c.bwriteresultf("%s NO [%s] %s %v", tag, uerr.code, cmd, err)
|
|
} else {
|
|
c.bwriteresultf("%s NO %s %v", tag, cmd, err)
|
|
}
|
|
} else {
|
|
result = "error"
|
|
c.log.Infox("imap command error", err, logFields...)
|
|
// todo: introduce a store.Error, and check for that, don't blindly pass on errors?
|
|
debug.PrintStack()
|
|
c.bwriteresultf("%s NO %s %v", tag, cmd, err)
|
|
}
|
|
}()
|
|
|
|
tag = "*"
|
|
cmd, p = c.readCommand(&tag)
|
|
cmdlow = strings.ToLower(cmd)
|
|
c.cmd = cmdlow
|
|
c.cmdStart = time.Now()
|
|
c.cmdMetric = "(unrecognized)"
|
|
|
|
select {
|
|
case <-mox.Shutdown:
|
|
// ../rfc/9051:5375
|
|
c.writelinef("* BYE shutting down")
|
|
panic(errIO)
|
|
default:
|
|
}
|
|
|
|
fn := commands[cmdlow]
|
|
if fn == nil {
|
|
xsyntaxErrorf("unknown command %q", cmd)
|
|
}
|
|
c.cmdMetric = c.cmd
|
|
|
|
// Check if command is allowed in this state.
|
|
if _, ok1 := commandsStateAny[cmdlow]; ok1 {
|
|
} else if _, ok2 := commandsStateNotAuthenticated[cmdlow]; ok2 && c.state == stateNotAuthenticated {
|
|
} else if _, ok3 := commandsStateAuthenticated[cmdlow]; ok3 && c.state == stateAuthenticated || c.state == stateSelected {
|
|
} else if _, ok4 := commandsStateSelected[cmdlow]; ok4 && c.state == stateSelected {
|
|
} else if ok1 || ok2 || ok3 || ok4 {
|
|
xuserErrorf("not allowed in this connection state")
|
|
} else {
|
|
xserverErrorf("unrecognized command")
|
|
}
|
|
|
|
fn(c, tag, cmd, p)
|
|
}
|
|
|
|
func (c *conn) broadcast(changes []store.Change) {
|
|
if len(changes) == 0 {
|
|
return
|
|
}
|
|
c.log.Debug("broadcast changes", mlog.Field("changes", changes))
|
|
c.comm.Broadcast(changes)
|
|
}
|
|
|
|
// matchStringer matches a string against reference + mailbox patterns.
|
|
type matchStringer interface {
|
|
MatchString(s string) bool
|
|
}
|
|
|
|
type noMatch struct{}
|
|
|
|
// MatchString for noMatch always returns false.
|
|
func (noMatch) MatchString(s string) bool {
|
|
return false
|
|
}
|
|
|
|
// xmailboxPatternMatcher returns a matcher for mailbox names given the reference and patterns.
|
|
// Patterns can include "%" and "*", matching any character excluding and including a slash respectively.
|
|
func xmailboxPatternMatcher(ref string, patterns []string) matchStringer {
|
|
if strings.HasPrefix(ref, "/") {
|
|
return noMatch{}
|
|
}
|
|
|
|
var subs []string
|
|
for _, pat := range patterns {
|
|
if strings.HasPrefix(pat, "/") {
|
|
continue
|
|
}
|
|
|
|
s := pat
|
|
if ref != "" {
|
|
s = filepath.Join(ref, pat)
|
|
}
|
|
|
|
// Fix casing for all Inbox paths.
|
|
first := strings.SplitN(s, "/", 2)[0]
|
|
if strings.EqualFold(first, "Inbox") {
|
|
s = "Inbox" + s[len("Inbox"):]
|
|
}
|
|
|
|
// ../rfc/9051:2361
|
|
var rs string
|
|
for _, c := range s {
|
|
if c == '%' {
|
|
rs += "[^/]*"
|
|
} else if c == '*' {
|
|
rs += ".*"
|
|
} else {
|
|
rs += regexp.QuoteMeta(string(c))
|
|
}
|
|
}
|
|
subs = append(subs, rs)
|
|
}
|
|
|
|
if len(subs) == 0 {
|
|
return noMatch{}
|
|
}
|
|
rs := "^(" + strings.Join(subs, "|") + ")$"
|
|
re, err := regexp.Compile(rs)
|
|
xcheckf(err, "compiling regexp for mailbox patterns")
|
|
return re
|
|
}
|
|
|
|
func (c *conn) sequence(uid store.UID) msgseq {
|
|
return uidSearch(c.uids, uid)
|
|
}
|
|
|
|
func uidSearch(uids []store.UID, uid store.UID) msgseq {
|
|
s := 0
|
|
e := len(uids)
|
|
for s < e {
|
|
i := (s + e) / 2
|
|
m := uids[i]
|
|
if uid == m {
|
|
return msgseq(i + 1)
|
|
} else if uid < m {
|
|
e = i
|
|
} else {
|
|
s = i + 1
|
|
}
|
|
}
|
|
return 0
|
|
}
|
|
|
|
func (c *conn) xsequence(uid store.UID) msgseq {
|
|
seq := c.sequence(uid)
|
|
if seq <= 0 {
|
|
xserverErrorf("unknown uid %d (%w)", uid, errProtocol)
|
|
}
|
|
return seq
|
|
}
|
|
|
|
func (c *conn) sequenceRemove(seq msgseq, uid store.UID) {
|
|
i := seq - 1
|
|
if c.uids[i] != uid {
|
|
xserverErrorf(fmt.Sprintf("got uid %d at msgseq %d, expected uid %d", uid, seq, c.uids[i]))
|
|
}
|
|
copy(c.uids[i:], c.uids[i+1:])
|
|
c.uids = c.uids[:len(c.uids)-1]
|
|
if sanityChecks {
|
|
checkUIDs(c.uids)
|
|
}
|
|
}
|
|
|
|
// add uid to the session. care must be taken that pending changes are fetched
|
|
// while holding the account wlock, and applied before adding this uid, because
|
|
// those pending changes may contain another new uid that has to be added first.
|
|
func (c *conn) uidAppend(uid store.UID) {
|
|
if uidSearch(c.uids, uid) > 0 {
|
|
xserverErrorf("uid already present (%w)", errProtocol)
|
|
}
|
|
if len(c.uids) > 0 && uid < c.uids[len(c.uids)-1] {
|
|
xserverErrorf("new uid %d is smaller than last uid %d (%w)", uid, c.uids[len(c.uids)-1], errProtocol)
|
|
}
|
|
c.uids = append(c.uids, uid)
|
|
if sanityChecks {
|
|
checkUIDs(c.uids)
|
|
}
|
|
}
|
|
|
|
// sanity check that uids are in ascending order.
|
|
func checkUIDs(uids []store.UID) {
|
|
for i, uid := range uids {
|
|
if uid == 0 || i > 0 && uid <= uids[i-1] {
|
|
xserverErrorf("bad uids %v", uids)
|
|
}
|
|
}
|
|
}
|
|
|
|
func (c *conn) xnumSetUIDs(isUID bool, nums numSet) []store.UID {
|
|
_, uids := c.xnumSetConditionUIDs(false, true, isUID, nums)
|
|
return uids
|
|
}
|
|
|
|
func (c *conn) xnumSetCondition(isUID bool, nums numSet) []any {
|
|
uidargs, _ := c.xnumSetConditionUIDs(true, false, isUID, nums)
|
|
return uidargs
|
|
}
|
|
|
|
func (c *conn) xnumSetConditionUIDs(forDB, returnUIDs bool, isUID bool, nums numSet) ([]any, []store.UID) {
|
|
if nums.searchResult {
|
|
// Update previously stored UIDs. Some may have been deleted.
|
|
// Once deleted a UID will never come back, so we'll just remove those uids.
|
|
o := 0
|
|
for _, uid := range c.searchResult {
|
|
if uidSearch(c.uids, uid) > 0 {
|
|
c.searchResult[o] = uid
|
|
o++
|
|
}
|
|
}
|
|
c.searchResult = c.searchResult[:o]
|
|
uidargs := make([]any, len(c.searchResult))
|
|
for i, uid := range c.searchResult {
|
|
uidargs[i] = uid
|
|
}
|
|
return uidargs, c.searchResult
|
|
}
|
|
|
|
var uidargs []any
|
|
var uids []store.UID
|
|
|
|
add := func(uid store.UID) {
|
|
if forDB {
|
|
uidargs = append(uidargs, uid)
|
|
}
|
|
if returnUIDs {
|
|
uids = append(uids, uid)
|
|
}
|
|
}
|
|
|
|
if !isUID {
|
|
// Sequence numbers that don't exist, or * on an empty mailbox, should result in a BAD response. ../rfc/9051:7018
|
|
for _, r := range nums.ranges {
|
|
var ia, ib int
|
|
if r.first.star {
|
|
if len(c.uids) == 0 {
|
|
xsyntaxErrorf("invalid seqset * on empty mailbox")
|
|
}
|
|
ia = len(c.uids) - 1
|
|
} else {
|
|
ia = int(r.first.number - 1)
|
|
if ia >= len(c.uids) {
|
|
xsyntaxErrorf("msgseq %d not in mailbox", r.first.number)
|
|
}
|
|
}
|
|
if r.last == nil {
|
|
add(c.uids[ia])
|
|
continue
|
|
}
|
|
|
|
if r.last.star {
|
|
if len(c.uids) == 0 {
|
|
xsyntaxErrorf("invalid seqset * on empty mailbox")
|
|
}
|
|
ib = len(c.uids) - 1
|
|
} else {
|
|
ib = int(r.last.number - 1)
|
|
if ib >= len(c.uids) {
|
|
xsyntaxErrorf("msgseq %d not in mailbox", r.last.number)
|
|
}
|
|
}
|
|
if ia > ib {
|
|
ia, ib = ib, ia
|
|
}
|
|
for _, uid := range c.uids[ia : ib+1] {
|
|
add(uid)
|
|
}
|
|
}
|
|
return uidargs, uids
|
|
}
|
|
|
|
// UIDs that do not exist can be ignored.
|
|
if len(c.uids) == 0 {
|
|
return nil, nil
|
|
}
|
|
|
|
for _, r := range nums.ranges {
|
|
last := r.first
|
|
if r.last != nil {
|
|
last = *r.last
|
|
}
|
|
|
|
uida := store.UID(r.first.number)
|
|
if r.first.star {
|
|
uida = c.uids[len(c.uids)-1]
|
|
}
|
|
|
|
uidb := store.UID(last.number)
|
|
if last.star {
|
|
uidb = c.uids[len(c.uids)-1]
|
|
}
|
|
|
|
if uida > uidb {
|
|
uida, uidb = uidb, uida
|
|
}
|
|
|
|
// Binary search for uida.
|
|
s := 0
|
|
e := len(c.uids)
|
|
for s < e {
|
|
m := (s + e) / 2
|
|
if uida < c.uids[m] {
|
|
e = m
|
|
} else if uida > c.uids[m] {
|
|
s = m + 1
|
|
} else {
|
|
break
|
|
}
|
|
}
|
|
|
|
for _, uid := range c.uids[s:] {
|
|
if uid >= uida && uid <= uidb {
|
|
add(uid)
|
|
} else if uid > uidb {
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
return uidargs, uids
|
|
}
|
|
|
|
func (c *conn) ok(tag, cmd string) {
|
|
c.bwriteresultf("%s OK %s done", tag, cmd)
|
|
c.xflush()
|
|
}
|
|
|
|
// xcheckmailboxname checks if name is valid, returning an INBOX-normalized name.
|
|
// I.e. it changes various casings of INBOX and INBOX/* to Inbox and Inbox/*.
|
|
// Name is invalid if it contains leading/trailing/double slashes, or when it isn't
|
|
// unicode-normalized, or when empty or has special characters.
|
|
func xcheckmailboxname(name string, allowInbox bool) string {
|
|
first := strings.SplitN(name, "/", 2)[0]
|
|
if strings.EqualFold(first, "inbox") {
|
|
if len(name) == len("inbox") && !allowInbox {
|
|
xuserErrorf("special mailbox name Inbox not allowed")
|
|
}
|
|
name = "Inbox" + name[len("Inbox"):]
|
|
}
|
|
|
|
if norm.NFC.String(name) != name {
|
|
xusercodeErrorf("CANNOT", "non-unicode-normalized mailbox names not allowed")
|
|
}
|
|
|
|
if name == "" {
|
|
xusercodeErrorf("CANNOT", "empty mailbox name")
|
|
}
|
|
if strings.HasPrefix(name, "/") || strings.HasSuffix(name, "/") || strings.Contains(name, "//") {
|
|
xusercodeErrorf("CANNOT", "bad slashes in mailbox name")
|
|
}
|
|
for _, c := range name {
|
|
switch c {
|
|
case '%', '*', '#', '&':
|
|
xusercodeErrorf("CANNOT", "character %c not allowed in mailbox name", c)
|
|
}
|
|
// ../rfc/6855:192
|
|
if c <= 0x1f || c >= 0x7f && c <= 0x9f || c == 0x2028 || c == 0x2029 {
|
|
xusercodeErrorf("CANNOT", "control characters not allowed in mailbox name")
|
|
}
|
|
}
|
|
return name
|
|
}
|
|
|
|
// Lookup mailbox by name.
|
|
// If the mailbox does not exist, panic is called with a user error.
|
|
// Must be called with account rlock held.
|
|
func (c *conn) xmailbox(tx *bstore.Tx, name string, missingErrCode string) store.Mailbox {
|
|
mb := c.account.MailboxFindX(tx, name)
|
|
if mb == nil {
|
|
// missingErrCode can be empty, or e.g. TRYCREATE or ALREADYEXISTS.
|
|
xusercodeErrorf(missingErrCode, "%w", store.ErrUnknownMailbox)
|
|
}
|
|
return *mb
|
|
}
|
|
|
|
// Lookup mailbox by ID.
|
|
// If the mailbox does not exist, panic is called with a user error.
|
|
// Must be called with account rlock held.
|
|
func (c *conn) xmailboxID(tx *bstore.Tx, id int64) store.Mailbox {
|
|
mb := store.Mailbox{ID: id}
|
|
err := tx.Get(&mb)
|
|
if err == bstore.ErrAbsent {
|
|
xuserErrorf("%w", store.ErrUnknownMailbox)
|
|
}
|
|
return mb
|
|
}
|
|
|
|
// Apply changes to our session state.
|
|
// If initial is false, updates like EXISTS and EXPUNGE are written to the client.
|
|
// If initial is true, we only apply the changes.
|
|
// Should not be called while holding locks, as changes are written to client connections, which can block.
|
|
// Does not flush output.
|
|
func (c *conn) applyChanges(changes []store.Change, initial bool) {
|
|
if len(changes) == 0 {
|
|
return
|
|
}
|
|
|
|
c.conn.SetWriteDeadline(time.Now().Add(5 * time.Minute))
|
|
|
|
c.log.Debug("applying changes", mlog.Field("changes", changes))
|
|
|
|
// Only keep changes for the selected mailbox, and changes that are always relevant.
|
|
var n []store.Change
|
|
for _, change := range changes {
|
|
var mbID int64
|
|
switch ch := change.(type) {
|
|
case store.ChangeAddUID:
|
|
mbID = ch.MailboxID
|
|
case store.ChangeRemoveUIDs:
|
|
mbID = ch.MailboxID
|
|
case store.ChangeFlags:
|
|
mbID = ch.MailboxID
|
|
case store.ChangeRemoveMailbox, store.ChangeAddMailbox, store.ChangeRenameMailbox, store.ChangeAddSubscription:
|
|
n = append(n, change)
|
|
continue
|
|
default:
|
|
panic(fmt.Errorf("missing case for %#v", change))
|
|
}
|
|
if c.state == stateSelected && mbID == c.mailboxID {
|
|
n = append(n, change)
|
|
}
|
|
}
|
|
changes = n
|
|
|
|
i := 0
|
|
for i < len(changes) {
|
|
// First process all new uids. So we only send a single EXISTS.
|
|
var adds []store.ChangeAddUID
|
|
for ; i < len(changes); i++ {
|
|
ch, ok := changes[i].(store.ChangeAddUID)
|
|
if !ok {
|
|
break
|
|
}
|
|
seq := c.sequence(ch.UID)
|
|
if seq > 0 && initial {
|
|
continue
|
|
}
|
|
c.uidAppend(ch.UID)
|
|
adds = append(adds, ch)
|
|
}
|
|
if len(adds) > 0 {
|
|
if initial {
|
|
continue
|
|
}
|
|
// Write the exists, and the UID and flags as well. Hopefully the client waits for
|
|
// long enough after the EXISTS to see these messages, and doesn't request them
|
|
// again with a FETCH.
|
|
c.bwritelinef("* %d EXISTS", len(c.uids))
|
|
for _, add := range adds {
|
|
seq := c.xsequence(add.UID)
|
|
c.bwritelinef("* %d FETCH (UID %d FLAGS %s)", seq, add.UID, flaglist(add.Flags).pack(c))
|
|
}
|
|
continue
|
|
}
|
|
|
|
change := changes[i]
|
|
i++
|
|
|
|
switch ch := change.(type) {
|
|
case store.ChangeRemoveUIDs:
|
|
for _, uid := range ch.UIDs {
|
|
var seq msgseq
|
|
if initial {
|
|
seq = c.sequence(uid)
|
|
if seq <= 0 {
|
|
continue
|
|
}
|
|
} else {
|
|
seq = c.xsequence(uid)
|
|
}
|
|
c.sequenceRemove(seq, uid)
|
|
if !initial {
|
|
c.bwritelinef("* %d EXPUNGE", seq)
|
|
}
|
|
}
|
|
case store.ChangeFlags:
|
|
// The uid can be unknown if we just expunged it while another session marked it as deleted just before.
|
|
seq := c.sequence(ch.UID)
|
|
if seq <= 0 {
|
|
continue
|
|
}
|
|
if !initial {
|
|
c.bwritelinef("* %d FETCH (UID %d FLAGS %s)", seq, ch.UID, flaglist(ch.Flags).pack(c))
|
|
}
|
|
case store.ChangeRemoveMailbox:
|
|
c.bwritelinef(`* LIST (\NonExistent) "/" %s`, astring(ch.Name).pack(c))
|
|
case store.ChangeAddMailbox:
|
|
c.bwritelinef(`* LIST (%s) "/" %s`, strings.Join(ch.Flags, " "), astring(ch.Name).pack(c))
|
|
case store.ChangeRenameMailbox:
|
|
c.bwritelinef(`* LIST (%s) "/" %s ("OLDNAME" (%s))`, strings.Join(ch.Flags, " "), astring(ch.NewName).pack(c), string0(ch.OldName).pack(c))
|
|
case store.ChangeAddSubscription:
|
|
c.bwritelinef(`* LIST (\Subscribed) "/" %s`, astring(ch.Name).pack(c))
|
|
default:
|
|
panic(fmt.Sprintf("internal error, missing case for %#v", change))
|
|
}
|
|
}
|
|
}
|
|
|
|
// Capability returns the capabilities this server implements and currently has
|
|
// available given the connection state.
|
|
//
|
|
// State: any
|
|
func (c *conn) cmdCapability(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:1208 ../rfc/3501:1300
|
|
|
|
// Request syntax: ../rfc/9051:6464 ../rfc/3501:4669
|
|
p.xempty()
|
|
|
|
caps := c.capabilities()
|
|
|
|
// Response syntax: ../rfc/9051:6427 ../rfc/3501:4655
|
|
c.bwritelinef("* CAPABILITY %s", caps)
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// capabilities returns non-empty string with available capabilities based on connection state.
|
|
// For use in cmdCapability and untagged OK responses on connection start, login and authenticate.
|
|
func (c *conn) capabilities() string {
|
|
caps := serverCapabilities
|
|
// ../rfc/9051:1238
|
|
if !c.tls {
|
|
caps += " STARTTLS"
|
|
}
|
|
if c.tls || c.noRequireSTARTTLS {
|
|
caps += " AUTH=PLAIN"
|
|
} else {
|
|
caps += " LOGINDISABLED"
|
|
}
|
|
return caps
|
|
}
|
|
|
|
// No op, but useful for retrieving pending changes as untagged responses, e.g. of
|
|
// message delivery.
|
|
//
|
|
// State: any
|
|
func (c *conn) cmdNoop(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:1261 ../rfc/3501:1363
|
|
|
|
// Request syntax: ../rfc/9051:6464 ../rfc/3501:4669
|
|
p.xempty()
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Logout, after which server closes the connection.
|
|
//
|
|
// State: any
|
|
func (c *conn) cmdLogout(tag, cmd string, p *parser) {
|
|
// Commands: ../rfc/3501:1407 ../rfc/9051:1290
|
|
|
|
// Request syntax: ../rfc/9051:6464 ../rfc/3501:4669
|
|
p.xempty()
|
|
|
|
c.unselect()
|
|
c.state = stateNotAuthenticated
|
|
// Response syntax: ../rfc/9051:6886 ../rfc/3501:4935
|
|
c.bwritelinef("* BYE thanks")
|
|
c.ok(tag, cmd)
|
|
panic(cleanClose)
|
|
}
|
|
|
|
// Clients can use ID to tell the server which software they are using. Servers can
|
|
// respond with their version. For statistics/logging/debugging purposes.
|
|
//
|
|
// State: any
|
|
func (c *conn) cmdID(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/2971:129
|
|
|
|
// Request syntax: ../rfc/2971:241
|
|
p.xspace()
|
|
var params map[string]string
|
|
if p.take("(") {
|
|
params = map[string]string{}
|
|
for !p.take(")") {
|
|
if len(params) > 0 {
|
|
p.xspace()
|
|
}
|
|
k := p.xstring()
|
|
p.xspace()
|
|
v := p.xnilString()
|
|
if _, ok := params[k]; ok {
|
|
xsyntaxErrorf("duplicate key %q", k)
|
|
}
|
|
params[k] = v
|
|
}
|
|
} else {
|
|
p.xnil()
|
|
}
|
|
p.xempty()
|
|
|
|
// We just log the client id.
|
|
c.log.Info("client id", mlog.Field("params", params))
|
|
|
|
// Response syntax: ../rfc/2971:243
|
|
// We send our name and version. ../rfc/2971:193
|
|
c.bwritelinef(`* ID ("name" "mox" "version" %s)`, string0(moxvar.Version).pack(c))
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// STARTTLS enables TLS on the connection, after a plain text start.
|
|
// Only allowed if TLS isn't already enabled, either through connecting to a
|
|
// TLS-enabled TCP port, or a previous STARTTLS command.
|
|
// After STARTTLS, plain text authentication typically becomes available.
|
|
//
|
|
// Status: Not authenticated.
|
|
func (c *conn) cmdStarttls(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:1340 ../rfc/3501:1468
|
|
|
|
// Request syntax: ../rfc/9051:6473 ../rfc/3501:4676
|
|
p.xempty()
|
|
|
|
if c.tls {
|
|
xsyntaxErrorf("tls already active") // ../rfc/9051:1353
|
|
}
|
|
|
|
conn := c.conn
|
|
if n := c.br.Buffered(); n > 0 {
|
|
buf := make([]byte, n)
|
|
_, err := io.ReadFull(c.br, buf)
|
|
xcheckf(err, "reading buffered data for tls handshake")
|
|
conn = &prefixConn{buf, conn}
|
|
}
|
|
c.ok(tag, cmd)
|
|
|
|
cidctx := context.WithValue(mox.Context, mlog.CidKey, c.cid)
|
|
ctx, cancel := context.WithTimeout(cidctx, time.Minute)
|
|
defer cancel()
|
|
tlsConn := tls.Server(conn, c.tlsConfig)
|
|
c.log.Debug("starting tls server handshake")
|
|
if err := tlsConn.HandshakeContext(ctx); err != nil {
|
|
panic(fmt.Errorf("starttls handshake: %s (%w)", err, errIO))
|
|
}
|
|
cancel()
|
|
tlsversion, ciphersuite := mox.TLSInfo(tlsConn)
|
|
c.log.Debug("tls server handshake done", mlog.Field("tls", tlsversion), mlog.Field("ciphersuite", ciphersuite))
|
|
|
|
c.conn = tlsConn
|
|
c.tr = moxio.NewTraceReader(c.log, "C: ", c.conn)
|
|
c.tw = moxio.NewTraceWriter(c.log, "S: ", c)
|
|
c.br = bufio.NewReader(c.tr)
|
|
c.bw = bufio.NewWriter(c.tw)
|
|
c.tls = true
|
|
}
|
|
|
|
// Authenticate using SASL. Supports multiple back and forths between client and
|
|
// server to finish authentication, unlike LOGIN which is just a single
|
|
// username/password.
|
|
//
|
|
// Status: Not authenticated.
|
|
func (c *conn) cmdAuthenticate(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:1403 ../rfc/3501:1519
|
|
// Examples: ../rfc/9051:1520 ../rfc/3501:1631
|
|
|
|
// For many failed auth attempts, slow down verification attempts.
|
|
if c.authFailed > 3 {
|
|
mox.Sleep(mox.Context, time.Duration(c.authFailed-3)*time.Second)
|
|
}
|
|
c.authFailed++ // Compensated on success.
|
|
defer func() {
|
|
// On the 3rd failed authentication, start responding slowly. Successful auth will
|
|
// cause fast responses again.
|
|
if c.authFailed >= 3 {
|
|
c.setSlow(true)
|
|
}
|
|
}()
|
|
|
|
var authVariant string
|
|
authResult := "error"
|
|
defer func() {
|
|
metrics.AuthenticationInc("imap", authVariant, authResult)
|
|
switch authResult {
|
|
case "ok":
|
|
mox.LimiterFailedAuth.Reset(c.remoteIP, time.Now())
|
|
default:
|
|
mox.LimiterFailedAuth.Add(c.remoteIP, time.Now(), 1)
|
|
}
|
|
}()
|
|
|
|
// Request syntax: ../rfc/9051:6341 ../rfc/3501:4561
|
|
p.xspace()
|
|
authType := p.xatom()
|
|
|
|
xreadInitial := func() []byte {
|
|
var line string
|
|
if p.empty() {
|
|
c.writelinef("+ ")
|
|
line = c.readline(false)
|
|
} else {
|
|
// ../rfc/9051:1407 ../rfc/4959:84
|
|
p.xspace()
|
|
line = p.remainder()
|
|
if line == "=" {
|
|
// ../rfc/9051:1450
|
|
line = "" // Base64 decode will result in empty buffer.
|
|
}
|
|
}
|
|
// ../rfc/9051:1442 ../rfc/3501:1553
|
|
if line == "*" {
|
|
authResult = "aborted"
|
|
xsyntaxErrorf("authenticate aborted by client")
|
|
}
|
|
buf, err := base64.StdEncoding.DecodeString(line)
|
|
if err != nil {
|
|
xsyntaxErrorf("parsing base64: %v", err)
|
|
}
|
|
return buf
|
|
}
|
|
|
|
xreadContinuation := func() []byte {
|
|
line := c.readline(false)
|
|
if line == "*" {
|
|
authResult = "aborted"
|
|
xsyntaxErrorf("authenticate aborted by client")
|
|
}
|
|
buf, err := base64.StdEncoding.DecodeString(line)
|
|
if err != nil {
|
|
xsyntaxErrorf("parsing base64: %v", err)
|
|
}
|
|
return buf
|
|
}
|
|
|
|
switch strings.ToUpper(authType) {
|
|
case "PLAIN":
|
|
authVariant = "plain"
|
|
|
|
if !c.noRequireSTARTTLS && !c.tls {
|
|
// ../rfc/9051:5194
|
|
xusercodeErrorf("PRIVACYREQUIRED", "tls required for login")
|
|
}
|
|
|
|
// Plain text passwords, mark as traceauth.
|
|
defer c.xtrace(mlog.LevelTraceauth)()
|
|
buf := xreadInitial()
|
|
c.xtrace(mlog.LevelTrace) // Restore.
|
|
plain := bytes.Split(buf, []byte{0})
|
|
if len(plain) != 3 {
|
|
xsyntaxErrorf("bad plain auth data, expected 3 nul-separated tokens, got %d tokens", len(plain))
|
|
}
|
|
authz := string(plain[0])
|
|
authc := string(plain[1])
|
|
password := string(plain[2])
|
|
|
|
if authz != "" && authz != authc {
|
|
xusercodeErrorf("AUTHORIZATIONFAILED", "cannot assume role")
|
|
}
|
|
|
|
acc, err := store.OpenEmailAuth(authc, password)
|
|
if err != nil {
|
|
if errors.Is(err, store.ErrUnknownCredentials) {
|
|
authResult = "badcreds"
|
|
xusercodeErrorf("AUTHENTICATIONFAILED", "bad credentials")
|
|
}
|
|
xusercodeErrorf("", "error")
|
|
}
|
|
c.account = acc
|
|
c.username = authc
|
|
|
|
case "CRAM-MD5":
|
|
authVariant = strings.ToLower(authType)
|
|
|
|
// ../rfc/9051:1462
|
|
p.xempty()
|
|
|
|
// ../rfc/2195:82
|
|
chal := fmt.Sprintf("<%d.%d@%s>", uint64(mox.CryptoRandInt()), time.Now().UnixNano(), mox.Conf.Static.HostnameDomain.ASCII)
|
|
c.writelinef("+ %s", base64.StdEncoding.EncodeToString([]byte(chal)))
|
|
|
|
resp := xreadContinuation()
|
|
t := strings.Split(string(resp), " ")
|
|
if len(t) != 2 || len(t[1]) != 2*md5.Size {
|
|
xsyntaxErrorf("malformed cram-md5 response")
|
|
}
|
|
addr := t[0]
|
|
c.log.Info("cram-md5 auth", mlog.Field("address", addr))
|
|
acc, _, err := store.OpenEmail(addr)
|
|
if err != nil {
|
|
if errors.Is(err, store.ErrUnknownCredentials) {
|
|
xusercodeErrorf("AUTHENTICATIONFAILED", "bad credentials")
|
|
}
|
|
xserverErrorf("looking up address: %v", err)
|
|
}
|
|
defer func() {
|
|
if acc != nil {
|
|
err := acc.Close()
|
|
c.xsanity(err, "close account")
|
|
}
|
|
}()
|
|
var ipadhash, opadhash hash.Hash
|
|
acc.WithRLock(func() {
|
|
err := acc.DB.Read(func(tx *bstore.Tx) error {
|
|
password, err := bstore.QueryTx[store.Password](tx).Get()
|
|
if err == bstore.ErrAbsent {
|
|
xusercodeErrorf("AUTHENTICATIONFAILED", "bad credentials")
|
|
}
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
ipadhash = password.CRAMMD5.Ipad
|
|
opadhash = password.CRAMMD5.Opad
|
|
return nil
|
|
})
|
|
xcheckf(err, "tx read")
|
|
})
|
|
if ipadhash == nil || opadhash == nil {
|
|
c.log.Info("cram-md5 auth attempt without derived secrets set, save password again to store secrets", mlog.Field("address", addr))
|
|
xusercodeErrorf("AUTHENTICATIONFAILED", "bad credentials")
|
|
}
|
|
|
|
// ../rfc/2195:138 ../rfc/2104:142
|
|
ipadhash.Write([]byte(chal))
|
|
opadhash.Write(ipadhash.Sum(nil))
|
|
digest := fmt.Sprintf("%x", opadhash.Sum(nil))
|
|
if digest != t[1] {
|
|
xusercodeErrorf("AUTHENTICATIONFAILED", "bad credentials")
|
|
}
|
|
|
|
c.account = acc
|
|
acc = nil // Cancel cleanup.
|
|
c.username = addr
|
|
|
|
case "SCRAM-SHA-1", "SCRAM-SHA-256":
|
|
// todo: improve handling of errors during scram. e.g. invalid parameters. should we abort the imap command, or continue until the end and respond with a scram-level error?
|
|
// todo: use single implementation between ../imapserver/server.go and ../smtpserver/server.go
|
|
|
|
authVariant = strings.ToLower(authType)
|
|
var h func() hash.Hash
|
|
if authVariant == "scram-sha-1" {
|
|
h = sha1.New
|
|
} else {
|
|
h = sha256.New
|
|
}
|
|
|
|
// No plaintext credentials, we can log these normally.
|
|
|
|
c0 := xreadInitial()
|
|
ss, err := scram.NewServer(h, c0)
|
|
if err != nil {
|
|
xsyntaxErrorf("starting scram: %w", err)
|
|
}
|
|
c.log.Info("scram auth", mlog.Field("authentication", ss.Authentication))
|
|
acc, _, err := store.OpenEmail(ss.Authentication)
|
|
if err != nil {
|
|
// todo: we could continue scram with a generated salt, deterministically generated
|
|
// from the username. that way we don't have to store anything but attackers cannot
|
|
// learn if an account exists. same for absent scram saltedpassword below.
|
|
xuserErrorf("scram not possible")
|
|
}
|
|
defer func() {
|
|
if acc != nil {
|
|
err := acc.Close()
|
|
c.xsanity(err, "close account")
|
|
}
|
|
}()
|
|
if ss.Authorization != "" && ss.Authorization != ss.Authentication {
|
|
xuserErrorf("authentication with authorization for different user not supported")
|
|
}
|
|
var xscram store.SCRAM
|
|
acc.WithRLock(func() {
|
|
err := acc.DB.Read(func(tx *bstore.Tx) error {
|
|
password, err := bstore.QueryTx[store.Password](tx).Get()
|
|
if authVariant == "scram-sha-1" {
|
|
xscram = password.SCRAMSHA1
|
|
} else {
|
|
xscram = password.SCRAMSHA256
|
|
}
|
|
if err == bstore.ErrAbsent || err == nil && (len(xscram.Salt) == 0 || xscram.Iterations == 0 || len(xscram.SaltedPassword) == 0) {
|
|
c.log.Info("scram auth attempt without derived secrets set, save password again to store secrets", mlog.Field("address", ss.Authentication))
|
|
xuserErrorf("scram not possible")
|
|
}
|
|
xcheckf(err, "fetching credentials")
|
|
return err
|
|
})
|
|
xcheckf(err, "read tx")
|
|
})
|
|
s1, err := ss.ServerFirst(xscram.Iterations, xscram.Salt)
|
|
xcheckf(err, "scram first server step")
|
|
c.writelinef("+ %s", base64.StdEncoding.EncodeToString([]byte(s1)))
|
|
c2 := xreadContinuation()
|
|
s3, err := ss.Finish(c2, xscram.SaltedPassword)
|
|
if len(s3) > 0 {
|
|
c.writelinef("+ %s", base64.StdEncoding.EncodeToString([]byte(s3)))
|
|
}
|
|
if err != nil {
|
|
c.readline(false) // Should be "*" for cancellation.
|
|
if errors.Is(err, scram.ErrInvalidProof) {
|
|
authResult = "badcreds"
|
|
xusercodeErrorf("AUTHENTICATIONFAILED", "bad credentials")
|
|
}
|
|
xuserErrorf("server final: %w", err)
|
|
}
|
|
|
|
// Client must still respond, but there is nothing to say. See ../rfc/9051:6221
|
|
// The message should be empty. todo: should we require it is empty?
|
|
xreadContinuation()
|
|
|
|
c.account = acc
|
|
acc = nil // Cancel cleanup.
|
|
c.username = ss.Authentication
|
|
|
|
default:
|
|
xuserErrorf("method not supported")
|
|
}
|
|
|
|
c.setSlow(false)
|
|
authResult = "ok"
|
|
c.authFailed = 0
|
|
c.comm = store.RegisterComm(c.account)
|
|
c.state = stateAuthenticated
|
|
c.writeresultf("%s OK [CAPABILITY %s] authenticate done", tag, c.capabilities())
|
|
}
|
|
|
|
// Login logs in with username and password.
|
|
//
|
|
// Status: Not authenticated.
|
|
func (c *conn) cmdLogin(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:1597 ../rfc/3501:1663
|
|
|
|
authResult := "error"
|
|
defer func() {
|
|
metrics.AuthenticationInc("imap", "login", authResult)
|
|
}()
|
|
|
|
// todo: get this line logged with traceauth. the plaintext password is included on the command line, which we've already read (before dispatching to this function).
|
|
|
|
// Request syntax: ../rfc/9051:6667 ../rfc/3501:4804
|
|
p.xspace()
|
|
userid := p.xastring()
|
|
p.xspace()
|
|
password := p.xastring()
|
|
p.xempty()
|
|
|
|
if !c.noRequireSTARTTLS && !c.tls {
|
|
// ../rfc/9051:5194
|
|
xusercodeErrorf("PRIVACYREQUIRED", "tls required for login")
|
|
}
|
|
|
|
// For many failed auth attempts, slow down verification attempts.
|
|
if c.authFailed > 3 {
|
|
mox.Sleep(mox.Context, time.Duration(c.authFailed-3)*time.Second)
|
|
}
|
|
c.authFailed++ // Compensated on success.
|
|
defer func() {
|
|
// On the 3rd failed authentication, start responding slowly. Successful auth will
|
|
// cause fast responses again.
|
|
if c.authFailed >= 3 {
|
|
c.setSlow(true)
|
|
}
|
|
}()
|
|
|
|
acc, err := store.OpenEmailAuth(userid, password)
|
|
if err != nil {
|
|
authResult = "badcreds"
|
|
var code string
|
|
if errors.Is(err, store.ErrUnknownCredentials) {
|
|
code = "AUTHENTICATIONFAILED"
|
|
}
|
|
xusercodeErrorf(code, "login failed")
|
|
}
|
|
c.account = acc
|
|
c.username = userid
|
|
c.authFailed = 0
|
|
c.setSlow(false)
|
|
c.comm = store.RegisterComm(acc)
|
|
c.state = stateAuthenticated
|
|
authResult = "ok"
|
|
c.writeresultf("%s OK [CAPABILITY %s] login done", tag, c.capabilities())
|
|
}
|
|
|
|
// Enable explicitly opts in to an extension. A server can typically send new kinds
|
|
// of responses to a client. Most extensions do not require an ENABLE because a
|
|
// client implicitly opts in to new response syntax by making a requests that uses
|
|
// new optional extension request syntax.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdEnable(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:1652 ../rfc/5161:80
|
|
// Examples: ../rfc/9051:1728 ../rfc/5161:147
|
|
|
|
// Request syntax: ../rfc/9051:6518 ../rfc/5161:207
|
|
p.xspace()
|
|
caps := []string{p.xatom()}
|
|
for !p.empty() {
|
|
p.xspace()
|
|
caps = append(caps, p.xatom())
|
|
}
|
|
|
|
// Clients should only send capabilities that need enabling.
|
|
// We should only echo that we recognize as needing enabling.
|
|
var enabled string
|
|
for _, s := range caps {
|
|
cap := capability(strings.ToUpper(s))
|
|
switch cap {
|
|
case capIMAP4rev2, capUTF8Accept:
|
|
c.enabled[cap] = true
|
|
enabled += " " + s
|
|
}
|
|
}
|
|
|
|
// Response syntax: ../rfc/9051:6520 ../rfc/5161:211
|
|
c.bwritelinef("* ENABLED%s", enabled)
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdSelect(tag, cmd string, p *parser) {
|
|
c.cmdSelectExamine(true, tag, cmd, p)
|
|
}
|
|
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdExamine(tag, cmd string, p *parser) {
|
|
c.cmdSelectExamine(false, tag, cmd, p)
|
|
}
|
|
|
|
// Select and examine are almost the same commands. Select just opens a mailbox for
|
|
// read/write and examine opens a mailbox readonly.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdSelectExamine(isselect bool, tag, cmd string, p *parser) {
|
|
// Select command: ../rfc/9051:1754 ../rfc/3501:1743
|
|
// Examine command: ../rfc/9051:1868 ../rfc/3501:1855
|
|
// Select examples: ../rfc/9051:1831 ../rfc/3501:1826
|
|
|
|
// Select request syntax: ../rfc/9051:7005 ../rfc/3501:4996
|
|
// Examine request syntax: ../rfc/9051:6551 ../rfc/3501:4746
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
p.xempty()
|
|
|
|
// Deselect before attempting the new select. This means we will deselect when an
|
|
// error occurs during select.
|
|
// ../rfc/9051:1809
|
|
if c.state == stateSelected {
|
|
// ../rfc/9051:1812
|
|
c.bwritelinef("* OK [CLOSED] x")
|
|
c.unselect()
|
|
}
|
|
|
|
name = xcheckmailboxname(name, true)
|
|
|
|
var firstUnseen msgseq = 0
|
|
var mb store.Mailbox
|
|
c.account.WithRLock(func() {
|
|
c.xdbread(func(tx *bstore.Tx) {
|
|
mb = c.xmailbox(tx, name, "")
|
|
|
|
q := bstore.QueryTx[store.Message](tx)
|
|
q.FilterNonzero(store.Message{MailboxID: mb.ID})
|
|
q.SortAsc("UID")
|
|
c.uids = []store.UID{}
|
|
var seq msgseq = 1
|
|
err := q.ForEach(func(m store.Message) error {
|
|
c.uids = append(c.uids, m.UID)
|
|
if firstUnseen == 0 && !m.Seen {
|
|
firstUnseen = seq
|
|
}
|
|
seq++
|
|
return nil
|
|
})
|
|
if sanityChecks {
|
|
checkUIDs(c.uids)
|
|
}
|
|
xcheckf(err, "fetching uids")
|
|
})
|
|
})
|
|
c.applyChanges(c.comm.Get(), true)
|
|
|
|
c.bwritelinef(`* FLAGS (\Seen \Answered \Flagged \Deleted \Draft $Forwarded $Junk $NotJunk $Phishing $MDNSent)`)
|
|
c.bwritelinef(`* OK [PERMANENTFLAGS (\Seen \Answered \Flagged \Deleted \Draft $Forwarded $Junk $NotJunk $Phishing $MDNSent)] x`)
|
|
if !c.enabled[capIMAP4rev2] {
|
|
c.bwritelinef(`* 0 RECENT`)
|
|
}
|
|
c.bwritelinef(`* %d EXISTS`, len(c.uids))
|
|
if !c.enabled[capIMAP4rev2] && firstUnseen > 0 {
|
|
// ../rfc/9051:8051 ../rfc/3501:1774
|
|
c.bwritelinef(`* OK [UNSEEN %d] x`, firstUnseen)
|
|
}
|
|
c.bwritelinef(`* OK [UIDVALIDITY %d] x`, mb.UIDValidity)
|
|
c.bwritelinef(`* OK [UIDNEXT %d] x`, mb.UIDNext)
|
|
c.bwritelinef(`* LIST () "/" %s`, astring(mb.Name).pack(c))
|
|
if isselect {
|
|
c.bwriteresultf("%s OK [READ-WRITE] x", tag)
|
|
c.readonly = false
|
|
} else {
|
|
c.bwriteresultf("%s OK [READ-ONLY] x", tag)
|
|
c.readonly = true
|
|
}
|
|
c.mailboxID = mb.ID
|
|
c.state = stateSelected
|
|
c.searchResult = nil
|
|
c.xflush()
|
|
}
|
|
|
|
// Create makes a new mailbox, and its parents too if absent.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdCreate(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:1900 ../rfc/3501:1888
|
|
// Examples: ../rfc/9051:1951 ../rfc/6154:411 ../rfc/4466:212 ../rfc/3501:1933
|
|
|
|
// Request syntax: ../rfc/9051:6484 ../rfc/6154:468 ../rfc/4466:500 ../rfc/3501:4687
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
// todo: support CREATE-SPECIAL-USE ../rfc/6154:296
|
|
p.xempty()
|
|
|
|
origName := name
|
|
name = strings.TrimRight(name, "/") // ../rfc/9051:1930
|
|
name = xcheckmailboxname(name, false)
|
|
|
|
var changes []store.Change
|
|
var created []string // Created mailbox names.
|
|
|
|
c.account.WithWLock(func() {
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
elems := strings.Split(name, "/")
|
|
var p string
|
|
for i, elem := range elems {
|
|
if i > 0 {
|
|
p += "/"
|
|
}
|
|
p += elem
|
|
if c.account.MailboxExistsX(tx, p) {
|
|
if i == len(elems)-1 {
|
|
// ../rfc/9051:1914
|
|
xuserErrorf("mailbox already exists")
|
|
}
|
|
continue
|
|
}
|
|
_, nchanges := c.account.MailboxEnsureX(tx, p, true)
|
|
changes = append(changes, nchanges...)
|
|
created = append(created, p)
|
|
}
|
|
})
|
|
|
|
c.broadcast(changes)
|
|
})
|
|
|
|
for _, n := range created {
|
|
var more string
|
|
if n == name && name != origName && !(name == "Inbox" || strings.HasPrefix(name, "Inbox/")) {
|
|
more = fmt.Sprintf(` ("OLDNAME" (%s))`, string0(origName).pack(c))
|
|
}
|
|
c.bwritelinef(`* LIST (\Subscribed) "/" %s%s`, astring(n).pack(c), more)
|
|
}
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Delete removes a mailbox and all its messages.
|
|
// Inbox cannot be removed.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdDelete(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:1972 ../rfc/3501:1946
|
|
// Examples: ../rfc/9051:2025 ../rfc/3501:1992
|
|
|
|
// Request syntax: ../rfc/9051:6505 ../rfc/3501:4716
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
p.xempty()
|
|
|
|
name = xcheckmailboxname(name, false)
|
|
|
|
// Messages to remove after having broadcasted the removal of messages.
|
|
var remove []store.Message
|
|
|
|
c.account.WithWLock(func() {
|
|
var mb store.Mailbox
|
|
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
mb = c.xmailbox(tx, name, "NONEXISTENT")
|
|
|
|
// Look for existence of child mailboxes. There is a lot of text in the RFCs about
|
|
// NoInferior and NoSelect. We just require only leaf mailboxes are deleted.
|
|
qmb := bstore.QueryTx[store.Mailbox](tx)
|
|
mbprefix := name + "/"
|
|
qmb.FilterFn(func(mb store.Mailbox) bool {
|
|
return strings.HasPrefix(mb.Name, mbprefix)
|
|
})
|
|
childExists, err := qmb.Exists()
|
|
xcheckf(err, "checking child existence")
|
|
if childExists {
|
|
xusercodeErrorf("HASCHILDREN", "mailbox has a child, only leaf mailboxes can be deleted")
|
|
}
|
|
|
|
qm := bstore.QueryTx[store.Message](tx)
|
|
qm.FilterNonzero(store.Message{MailboxID: mb.ID})
|
|
remove, err = qm.List()
|
|
xcheckf(err, "listing messages to remove")
|
|
|
|
if len(remove) > 0 {
|
|
removeIDs := make([]any, len(remove))
|
|
for i, m := range remove {
|
|
removeIDs[i] = m.ID
|
|
}
|
|
qmr := bstore.QueryTx[store.Recipient](tx)
|
|
qmr.FilterEqual("MessageID", removeIDs...)
|
|
_, err = qmr.Delete()
|
|
xcheckf(err, "removing message recipients for messages")
|
|
|
|
qm = bstore.QueryTx[store.Message](tx)
|
|
qm.FilterNonzero(store.Message{MailboxID: mb.ID})
|
|
_, err = qm.Delete()
|
|
xcheckf(err, "removing messages")
|
|
|
|
conf, _ := c.account.Conf()
|
|
if name != conf.RejectsMailbox {
|
|
err = c.account.Untrain(c.log, remove)
|
|
xcheckf(err, "untraining deleted messages")
|
|
}
|
|
}
|
|
|
|
err = tx.Delete(&store.Mailbox{ID: mb.ID})
|
|
xcheckf(err, "removing mailbox")
|
|
})
|
|
|
|
c.broadcast([]store.Change{store.ChangeRemoveMailbox{Name: name}})
|
|
})
|
|
|
|
for _, m := range remove {
|
|
p := c.account.MessagePath(m.ID)
|
|
if err := os.Remove(p); err != nil {
|
|
c.log.Infox("removing message file for mailbox delete", err, mlog.Field("path", p))
|
|
}
|
|
}
|
|
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Rename changes the name of a mailbox.
|
|
// Renaming INBOX is special, it moves the inbox messages to a new mailbox, leaving inbox empty.
|
|
// Renaming a mailbox with submailboxes also renames all submailboxes.
|
|
// Subscriptions stay with the old name, though newly created missing parent
|
|
// mailboxes for the destination name are automatically subscribed.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdRename(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:2062 ../rfc/3501:2040
|
|
// Examples: ../rfc/9051:2132 ../rfc/3501:2092
|
|
|
|
// Request syntax: ../rfc/9051:6863 ../rfc/3501:4908
|
|
p.xspace()
|
|
src := p.xmailbox()
|
|
p.xspace()
|
|
dst := p.xmailbox()
|
|
p.xempty()
|
|
|
|
src = xcheckmailboxname(src, true)
|
|
dst = xcheckmailboxname(dst, false)
|
|
|
|
c.account.WithWLock(func() {
|
|
var changes []store.Change
|
|
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
uidval, err := c.account.NextUIDValidity(tx)
|
|
xcheckf(err, "next uid validity")
|
|
|
|
// Inbox is very special case. Unlike other mailboxes, its children are not moved. And
|
|
// unlike a regular move, its messages are moved to a newly created mailbox.
|
|
// We do indeed create a new destination mailbox and actually move the messages.
|
|
// ../rfc/9051:2101
|
|
if src == "Inbox" {
|
|
if c.account.MailboxExistsX(tx, dst) {
|
|
xusercodeErrorf("ALREADYEXISTS", "destination mailbox %q already exists", dst)
|
|
}
|
|
srcMB := c.account.MailboxFindX(tx, src)
|
|
if srcMB == nil {
|
|
xserverErrorf("inbox not found")
|
|
}
|
|
if dst == src {
|
|
xuserErrorf("cannot move inbox to itself")
|
|
}
|
|
|
|
dstMB := store.Mailbox{
|
|
Name: dst,
|
|
UIDValidity: uidval,
|
|
UIDNext: 1,
|
|
}
|
|
err := tx.Insert(&dstMB)
|
|
xcheckf(err, "create new destination mailbox")
|
|
|
|
var messages []store.Message
|
|
q := bstore.QueryTx[store.Message](tx)
|
|
q.FilterNonzero(store.Message{MailboxID: srcMB.ID})
|
|
q.Gather(&messages)
|
|
_, err = q.UpdateNonzero(store.Message{MailboxID: dstMB.ID})
|
|
xcheckf(err, "moving messages from inbox to destination mailbox")
|
|
|
|
uids := make([]store.UID, len(messages))
|
|
for i, m := range messages {
|
|
uids[i] = m.UID
|
|
}
|
|
var dstFlags []string
|
|
if tx.Get(&store.Subscription{Name: dstMB.Name}) == nil {
|
|
dstFlags = []string{`\Subscribed`}
|
|
}
|
|
changes = []store.Change{
|
|
store.ChangeRemoveUIDs{MailboxID: srcMB.ID, UIDs: uids},
|
|
store.ChangeAddMailbox{Name: dstMB.Name, Flags: dstFlags},
|
|
// todo: in future, we could announce all messages. no one is listening now though.
|
|
}
|
|
return
|
|
}
|
|
|
|
// We gather existing mailboxes that we need for deciding what to create/delete/update.
|
|
q := bstore.QueryTx[store.Mailbox](tx)
|
|
srcPrefix := src + "/"
|
|
dstRoot := strings.SplitN(dst, "/", 2)[0]
|
|
dstRootPrefix := dstRoot + "/"
|
|
q.FilterFn(func(mb store.Mailbox) bool {
|
|
return mb.Name == src || strings.HasPrefix(mb.Name, srcPrefix) || mb.Name == dstRoot || strings.HasPrefix(mb.Name, dstRootPrefix)
|
|
})
|
|
q.SortAsc("Name") // We'll rename the parents before children.
|
|
l, err := q.List()
|
|
xcheckf(err, "listing relevant mailboxes")
|
|
|
|
mailboxes := map[string]store.Mailbox{}
|
|
for _, mb := range l {
|
|
mailboxes[mb.Name] = mb
|
|
}
|
|
|
|
if _, ok := mailboxes[src]; !ok {
|
|
// ../rfc/9051:5140
|
|
xusercodeErrorf("NONEXISTENT", "mailbox does not exist")
|
|
}
|
|
|
|
// Ensure parent mailboxes for the destination paths exist.
|
|
var parent string
|
|
dstElems := strings.Split(dst, "/")
|
|
for i, elem := range dstElems[:len(dstElems)-1] {
|
|
if i > 0 {
|
|
parent += "/"
|
|
}
|
|
parent += elem
|
|
|
|
mb, ok := mailboxes[parent]
|
|
if ok {
|
|
continue
|
|
}
|
|
omb := mb
|
|
mb = store.Mailbox{
|
|
ID: omb.ID,
|
|
Name: parent,
|
|
UIDValidity: uidval,
|
|
UIDNext: 1,
|
|
}
|
|
err = tx.Insert(&mb)
|
|
xcheckf(err, "creating parent mailbox")
|
|
err = tx.Insert(&store.Subscription{Name: parent})
|
|
if err != nil && !errors.Is(err, bstore.ErrUnique) {
|
|
xcheckf(err, "creating subscription")
|
|
}
|
|
changes = append(changes, store.ChangeAddMailbox{Name: parent, Flags: []string{`\Subscribed`}})
|
|
}
|
|
|
|
// Process src mailboxes, renaming them to dst.
|
|
for _, srcmb := range l {
|
|
if srcmb.Name != src && !strings.HasPrefix(srcmb.Name, srcPrefix) {
|
|
continue
|
|
}
|
|
srcName := srcmb.Name
|
|
dstName := dst + srcmb.Name[len(src):]
|
|
if _, ok := mailboxes[dstName]; ok {
|
|
xusercodeErrorf("ALREADYEXISTS", "destination mailbox %q already exists", dstName)
|
|
}
|
|
|
|
srcmb.Name = dstName
|
|
srcmb.UIDValidity = uidval
|
|
err = tx.Update(&srcmb)
|
|
xcheckf(err, "renaming mailbox")
|
|
|
|
// Renaming Inbox is special, it leaves an empty inbox instead of removing it.
|
|
var dstFlags []string
|
|
if tx.Get(&store.Subscription{Name: dstName}) == nil {
|
|
dstFlags = []string{`\Subscribed`}
|
|
}
|
|
changes = append(changes, store.ChangeRenameMailbox{OldName: srcName, NewName: dstName, Flags: dstFlags})
|
|
}
|
|
|
|
// If we renamed e.g. a/b to a/b/c/d, and a/b/c to a/b/c/d/c, we'll have to recreate a/b and a/b/c.
|
|
srcElems := strings.Split(src, "/")
|
|
xsrc := src
|
|
for i := 0; i < len(dstElems) && strings.HasPrefix(dst, xsrc+"/"); i++ {
|
|
mb := store.Mailbox{
|
|
UIDValidity: uidval,
|
|
UIDNext: 1,
|
|
Name: xsrc,
|
|
}
|
|
err = tx.Insert(&mb)
|
|
xcheckf(err, "creating mailbox at old path")
|
|
xsrc += "/" + dstElems[len(srcElems)+i]
|
|
}
|
|
})
|
|
c.broadcast(changes)
|
|
})
|
|
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Subscribe marks a mailbox path as subscribed. The mailbox does not have to
|
|
// exist. Subscribed may mean an email client will show the mailbox in its UI
|
|
// and/or periodically fetch new messages for the mailbox.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdSubscribe(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:2172 ../rfc/3501:2135
|
|
// Examples: ../rfc/9051:2198 ../rfc/3501:2162
|
|
|
|
// Request syntax: ../rfc/9051:7083 ../rfc/3501:5059
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
p.xempty()
|
|
|
|
name = xcheckmailboxname(name, true)
|
|
|
|
c.account.WithWLock(func() {
|
|
var changes []store.Change
|
|
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
changes = c.account.SubscriptionEnsureX(tx, name)
|
|
})
|
|
|
|
c.broadcast(changes)
|
|
})
|
|
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Unsubscribe marks a mailbox as not subscribed. The mailbox doesn't have to exist.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdUnsubscribe(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:2203 ../rfc/3501:2166
|
|
// Examples: ../rfc/9051:2219 ../rfc/3501:2181
|
|
|
|
// Request syntax: ../rfc/9051:7143 ../rfc/3501:5077
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
p.xempty()
|
|
|
|
name = xcheckmailboxname(name, true)
|
|
|
|
c.account.WithWLock(func() {
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
// It's OK if not currently subscribed, ../rfc/9051:2215
|
|
err := tx.Delete(&store.Subscription{Name: name})
|
|
if err == bstore.ErrAbsent {
|
|
if !c.account.MailboxExistsX(tx, name) {
|
|
xuserErrorf("mailbox does not exist")
|
|
}
|
|
return
|
|
}
|
|
xcheckf(err, "removing subscription")
|
|
})
|
|
|
|
// todo: can we send untagged message about a mailbox no longer being subscribed?
|
|
})
|
|
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// LSUB command for listing subscribed mailboxes.
|
|
// Removed in IMAP4rev2, only in IMAP4rev1.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdLsub(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/3501:2374
|
|
// Examples: ../rfc/3501:2415
|
|
|
|
// Request syntax: ../rfc/3501:4806
|
|
p.xspace()
|
|
ref := p.xmailbox()
|
|
p.xspace()
|
|
pattern := p.xlistMailbox()
|
|
p.xempty()
|
|
|
|
re := xmailboxPatternMatcher(ref, []string{pattern})
|
|
|
|
var lines []string
|
|
c.xdbread(func(tx *bstore.Tx) {
|
|
q := bstore.QueryTx[store.Subscription](tx)
|
|
q.SortAsc("Name")
|
|
subscriptions, err := q.List()
|
|
xcheckf(err, "querying subscriptions")
|
|
|
|
have := map[string]bool{}
|
|
subscribedKids := map[string]bool{}
|
|
ispercent := strings.HasSuffix(pattern, "%")
|
|
for _, sub := range subscriptions {
|
|
name := sub.Name
|
|
if ispercent {
|
|
for p := filepath.Dir(name); p != "."; p = filepath.Dir(p) {
|
|
subscribedKids[p] = true
|
|
}
|
|
}
|
|
if !re.MatchString(name) {
|
|
continue
|
|
}
|
|
have[name] = true
|
|
line := fmt.Sprintf(`* LSUB () "/" %s`, astring(name).pack(c))
|
|
lines = append(lines, line)
|
|
|
|
}
|
|
|
|
// ../rfc/3501:2394
|
|
if !ispercent {
|
|
return
|
|
}
|
|
qmb := bstore.QueryTx[store.Mailbox](tx)
|
|
qmb.SortAsc("Name")
|
|
err = qmb.ForEach(func(mb store.Mailbox) error {
|
|
if have[mb.Name] || !subscribedKids[mb.Name] || !re.MatchString(mb.Name) {
|
|
return nil
|
|
}
|
|
line := fmt.Sprintf(`* LSUB (\NoSelect) "/" %s`, astring(mb.Name).pack(c))
|
|
lines = append(lines, line)
|
|
return nil
|
|
})
|
|
xcheckf(err, "querying mailboxes")
|
|
})
|
|
|
|
// Response syntax: ../rfc/3501:4833 ../rfc/3501:4837
|
|
for _, line := range lines {
|
|
c.bwritelinef("%s", line)
|
|
}
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// The namespace command returns the mailbox path separator. We only implement
|
|
// the personal mailbox hierarchy, no shared/other.
|
|
//
|
|
// In IMAP4rev2, it was an extension before.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdNamespace(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:3098 ../rfc/2342:137
|
|
// Examples: ../rfc/9051:3117 ../rfc/2342:155
|
|
// Request syntax: ../rfc/9051:6767 ../rfc/2342:410
|
|
p.xempty()
|
|
|
|
// Response syntax: ../rfc/9051:6778 ../rfc/2342:415
|
|
c.bwritelinef(`* NAMESPACE (("" "/")) NIL NIL`)
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// The status command returns information about a mailbox, such as the number of
|
|
// messages, "uid validity", etc. Nowadays, the extended LIST command can return
|
|
// the same information about many mailboxes for one command.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdStatus(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:3328 ../rfc/3501:2424
|
|
// Examples: ../rfc/9051:3400 ../rfc/3501:2501
|
|
|
|
// Request syntax: ../rfc/9051:7053 ../rfc/3501:5036
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
p.xspace()
|
|
p.xtake("(")
|
|
attrs := []string{p.xstatusAtt()}
|
|
for !p.take(")") {
|
|
p.xspace()
|
|
attrs = append(attrs, p.xstatusAtt())
|
|
}
|
|
p.xempty()
|
|
|
|
name = xcheckmailboxname(name, true)
|
|
|
|
var mb store.Mailbox
|
|
|
|
var responseLine string
|
|
c.account.WithRLock(func() {
|
|
c.xdbread(func(tx *bstore.Tx) {
|
|
mb = c.xmailbox(tx, name, "")
|
|
responseLine = c.xstatusLine(tx, mb, attrs)
|
|
})
|
|
})
|
|
|
|
c.bwritelinef("%s", responseLine)
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Response syntax: ../rfc/9051:6681 ../rfc/9051:7070 ../rfc/9051:7059 ../rfc/3501:4834
|
|
func (c *conn) xstatusLine(tx *bstore.Tx, mb store.Mailbox, attrs []string) string {
|
|
var count, unseen, deleted int
|
|
var size int64
|
|
|
|
q := bstore.QueryTx[store.Message](tx)
|
|
q.FilterNonzero(store.Message{MailboxID: mb.ID})
|
|
err := q.ForEach(func(m store.Message) error {
|
|
count++
|
|
if !m.Seen {
|
|
unseen++
|
|
}
|
|
if m.Deleted {
|
|
deleted++
|
|
}
|
|
size += m.Size
|
|
return nil
|
|
})
|
|
xcheckf(err, "processing mailbox messages")
|
|
|
|
status := []string{}
|
|
for _, a := range attrs {
|
|
A := strings.ToUpper(a)
|
|
switch A {
|
|
case "MESSAGES":
|
|
status = append(status, A, fmt.Sprintf("%d", count))
|
|
case "UIDNEXT":
|
|
status = append(status, A, fmt.Sprintf("%d", mb.UIDNext))
|
|
case "UIDVALIDITY":
|
|
status = append(status, A, fmt.Sprintf("%d", mb.UIDValidity))
|
|
case "UNSEEN":
|
|
status = append(status, A, fmt.Sprintf("%d", unseen))
|
|
case "DELETED":
|
|
status = append(status, A, fmt.Sprintf("%d", deleted))
|
|
case "SIZE":
|
|
status = append(status, A, fmt.Sprintf("%d", size))
|
|
case "RECENT":
|
|
status = append(status, A, "0")
|
|
case "APPENDLIMIT":
|
|
// ../rfc/7889:255
|
|
status = append(status, A, "NIL")
|
|
default:
|
|
xsyntaxErrorf("unknown attribute %q", a)
|
|
}
|
|
}
|
|
return fmt.Sprintf("* STATUS %s (%s)", astring(mb.Name).pack(c), strings.Join(status, " "))
|
|
}
|
|
|
|
func xparseStoreFlags(l []string, syntax bool) (flags store.Flags) {
|
|
fields := map[string]*bool{
|
|
`\answered`: &flags.Answered,
|
|
`\flagged`: &flags.Flagged,
|
|
`\deleted`: &flags.Deleted,
|
|
`\seen`: &flags.Seen,
|
|
`\draft`: &flags.Draft,
|
|
`$junk`: &flags.Junk,
|
|
`$notjunk`: &flags.Notjunk,
|
|
`$forwarded`: &flags.Forwarded,
|
|
`$phishing`: &flags.Phishing,
|
|
`$mdnsent`: &flags.MDNSent,
|
|
}
|
|
for _, f := range l {
|
|
if field, ok := fields[strings.ToLower(f)]; !ok {
|
|
if syntax {
|
|
xsyntaxErrorf("unknown flag %q", f)
|
|
}
|
|
xuserErrorf("unknown flag %q", f)
|
|
} else {
|
|
*field = true
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func flaglist(fl store.Flags) listspace {
|
|
l := listspace{}
|
|
flag := func(v bool, s string) {
|
|
if v {
|
|
l = append(l, bare(s))
|
|
}
|
|
}
|
|
flag(fl.Seen, `\Seen`)
|
|
flag(fl.Answered, `\Answered`)
|
|
flag(fl.Flagged, `\Flagged`)
|
|
flag(fl.Deleted, `\Deleted`)
|
|
flag(fl.Draft, `\Draft`)
|
|
flag(fl.Forwarded, `$Forwarded`)
|
|
flag(fl.Junk, `$Junk`)
|
|
flag(fl.Notjunk, `$NotJunk`)
|
|
flag(fl.Phishing, `$Phishing`)
|
|
flag(fl.MDNSent, `$MDNSent`)
|
|
return l
|
|
}
|
|
|
|
// Append adds a message to a mailbox.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdAppend(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:3406 ../rfc/6855:204 ../rfc/3501:2527
|
|
// Examples: ../rfc/9051:3482 ../rfc/3501:2589
|
|
|
|
// Request syntax: ../rfc/9051:6325 ../rfc/6855:219 ../rfc/3501:4547
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
p.xspace()
|
|
var storeFlags store.Flags
|
|
if p.hasPrefix("(") {
|
|
// Error must be a syntax error, to properly abort the connection due to literal.
|
|
storeFlags = xparseStoreFlags(p.xflagList(), true)
|
|
p.xspace()
|
|
}
|
|
var tm time.Time
|
|
if p.hasPrefix(`"`) {
|
|
tm = p.xdateTime()
|
|
p.xspace()
|
|
} else {
|
|
tm = time.Now()
|
|
}
|
|
// todo: only with utf8 should we we accept message headers with utf-8. we currently always accept them.
|
|
// todo: this is only relevant if we also support the CATENATE extension?
|
|
// ../rfc/6855:204
|
|
utf8 := p.take("UTF8 (")
|
|
size, sync := p.xliteralSize(0, utf8)
|
|
|
|
name = xcheckmailboxname(name, true)
|
|
c.xdbread(func(tx *bstore.Tx) {
|
|
c.xmailbox(tx, name, "TRYCREATE")
|
|
})
|
|
if sync {
|
|
c.writelinef("+")
|
|
}
|
|
|
|
// Read the message into a temporary file.
|
|
msgFile, err := store.CreateMessageTemp("imap-append")
|
|
xcheckf(err, "creating temp file for message")
|
|
defer func() {
|
|
if msgFile != nil {
|
|
err := os.Remove(msgFile.Name())
|
|
c.xsanity(err, "removing APPEND temporary file")
|
|
err = msgFile.Close()
|
|
c.xsanity(err, "closing APPEND temporary file")
|
|
}
|
|
}()
|
|
defer c.xtrace(mlog.LevelTracedata)()
|
|
mw := &message.Writer{Writer: msgFile}
|
|
msize, err := io.Copy(mw, io.LimitReader(c.br, size))
|
|
c.xtrace(mlog.LevelTrace) // Restore.
|
|
if err != nil {
|
|
// Cannot use xcheckf due to %w handling of errIO.
|
|
panic(fmt.Errorf("reading literal message: %s (%w)", err, errIO))
|
|
}
|
|
if msize != size {
|
|
xserverErrorf("read %d bytes for message, expected %d (%w)", msize, size, errIO)
|
|
}
|
|
msgPrefix := []byte{}
|
|
// todo: should we treat the message as body? i believe headers are required in messages, and bodies are optional. so would make more sense to treat the data as headers. perhaps only if the headers are valid?
|
|
if !mw.HaveHeaders {
|
|
msgPrefix = []byte("\r\n")
|
|
}
|
|
|
|
if utf8 {
|
|
line := c.readline(false)
|
|
np := newParser(line, c)
|
|
np.xtake(")")
|
|
np.xempty()
|
|
} else {
|
|
line := c.readline(false)
|
|
np := newParser(line, c)
|
|
np.xempty()
|
|
}
|
|
p.xempty()
|
|
if !sync {
|
|
name = xcheckmailboxname(name, true)
|
|
}
|
|
|
|
var mb store.Mailbox
|
|
var msg store.Message
|
|
var pendingChanges []store.Change
|
|
|
|
c.account.WithWLock(func() {
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
mb = c.xmailbox(tx, name, "TRYCREATE")
|
|
msg = store.Message{
|
|
MailboxID: mb.ID,
|
|
MailboxOrigID: mb.ID,
|
|
Received: tm,
|
|
Flags: storeFlags,
|
|
Size: size,
|
|
MsgPrefix: msgPrefix,
|
|
}
|
|
isSent := name == "Sent"
|
|
c.account.DeliverX(c.log, tx, &msg, msgFile, true, isSent, true, true)
|
|
})
|
|
|
|
// Fetch pending changes, possibly with new UIDs, so we can apply them before adding our own new UID.
|
|
if c.comm != nil {
|
|
pendingChanges = c.comm.Get()
|
|
}
|
|
|
|
// Broadcast the change to other connections.
|
|
c.broadcast([]store.Change{store.ChangeAddUID{MailboxID: mb.ID, UID: msg.UID, Flags: msg.Flags}})
|
|
})
|
|
|
|
msgFile.Close()
|
|
msgFile = nil
|
|
|
|
if c.mailboxID == mb.ID {
|
|
c.applyChanges(pendingChanges, false)
|
|
c.uidAppend(msg.UID)
|
|
c.bwritelinef("* %d EXISTS", len(c.uids))
|
|
}
|
|
|
|
c.writeresultf("%s OK [APPENDUID %d %d] appended", tag, mb.UIDValidity, msg.UID)
|
|
}
|
|
|
|
// Idle makes a client wait until the server sends untagged updates, e.g. about
|
|
// message delivery or mailbox create/rename/delete/subscription, etc. It allows a
|
|
// client to get updates in real-time, not needing the use for NOOP.
|
|
//
|
|
// State: Authenticated and selected.
|
|
func (c *conn) cmdIdle(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:3542 ../rfc/2177:49
|
|
// Example: ../rfc/9051:3589 ../rfc/2177:119
|
|
|
|
// Request syntax: ../rfc/9051:6594 ../rfc/2177:163
|
|
p.xempty()
|
|
|
|
c.writelinef("+ waiting")
|
|
|
|
var line string
|
|
wait:
|
|
for {
|
|
select {
|
|
case le := <-c.lineChan():
|
|
c.line = nil
|
|
xcheckf(le.err, "get line")
|
|
line = le.line
|
|
break wait
|
|
case changes := <-c.comm.Changes:
|
|
c.applyChanges(changes, false)
|
|
c.xflush()
|
|
case <-mox.Shutdown:
|
|
// ../rfc/9051:5375
|
|
c.writelinef("* BYE shutting down")
|
|
panic(errIO)
|
|
}
|
|
}
|
|
|
|
// Reset the write deadline. In case of little activity, with a command timeout of
|
|
// 30 minutes, we have likely passed it.
|
|
c.conn.SetWriteDeadline(time.Now().Add(5 * time.Minute))
|
|
|
|
if strings.ToUpper(line) != "DONE" {
|
|
// We just close the connection because our protocols are out of sync.
|
|
panic(fmt.Errorf("%w: in IDLE, expected DONE", errIO))
|
|
}
|
|
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Check is an old deprecated command that is supposed to execute some mailbox consistency checks.
|
|
//
|
|
// State: Selected
|
|
func (c *conn) cmdCheck(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/3501:2618
|
|
|
|
// Request syntax: ../rfc/3501:4679
|
|
p.xempty()
|
|
|
|
c.account.WithRLock(func() {
|
|
c.xdbread(func(tx *bstore.Tx) {
|
|
c.xmailboxID(tx, c.mailboxID) // Validate.
|
|
})
|
|
})
|
|
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Close undoes select/examine, closing the currently opened mailbox and deleting
|
|
// messages that were marked for deletion with the \Deleted flag.
|
|
//
|
|
// State: Selected
|
|
func (c *conn) cmdClose(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:3636 ../rfc/3501:2652
|
|
|
|
// Request syntax: ../rfc/9051:6476 ../rfc/3501:4679
|
|
p.xempty()
|
|
|
|
if c.readonly {
|
|
c.unselect()
|
|
c.ok(tag, cmd)
|
|
return
|
|
}
|
|
|
|
remove := c.xexpunge(nil, true)
|
|
|
|
defer func() {
|
|
for _, m := range remove {
|
|
p := c.account.MessagePath(m.ID)
|
|
err := os.Remove(p)
|
|
c.xsanity(err, "removing message file for expunge for close")
|
|
}
|
|
}()
|
|
|
|
c.unselect()
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// expunge messages marked for deletion in currently selected/active mailbox.
|
|
// if uidSet is not nil, only messages matching the set are deleted.
|
|
// messages that have been deleted from the database returned, but the corresponding files still have to be removed.
|
|
func (c *conn) xexpunge(uidSet *numSet, missingMailboxOK bool) []store.Message {
|
|
var remove []store.Message
|
|
|
|
c.account.WithWLock(func() {
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
mb := store.Mailbox{ID: c.mailboxID}
|
|
err := tx.Get(&mb)
|
|
if err == bstore.ErrAbsent {
|
|
if missingMailboxOK {
|
|
return
|
|
}
|
|
xuserErrorf("%w", store.ErrUnknownMailbox)
|
|
}
|
|
|
|
qm := bstore.QueryTx[store.Message](tx)
|
|
qm.FilterNonzero(store.Message{MailboxID: c.mailboxID})
|
|
qm.FilterEqual("Deleted", true)
|
|
qm.FilterFn(func(m store.Message) bool {
|
|
// Only remove if this session knows about the message and if present in optional uidSet.
|
|
return uidSearch(c.uids, m.UID) > 0 && (uidSet == nil || uidSet.containsUID(m.UID, c.uids, c.searchResult))
|
|
})
|
|
qm.SortAsc("UID")
|
|
remove, err = qm.List()
|
|
xcheckf(err, "listing messages to delete")
|
|
|
|
if len(remove) == 0 {
|
|
return
|
|
}
|
|
|
|
removeIDs := make([]int64, len(remove))
|
|
anyIDs := make([]any, len(remove))
|
|
for i, m := range remove {
|
|
removeIDs[i] = m.ID
|
|
anyIDs[i] = m.ID
|
|
}
|
|
qmr := bstore.QueryTx[store.Recipient](tx)
|
|
qmr.FilterEqual("MessageID", anyIDs...)
|
|
_, err = qmr.Delete()
|
|
xcheckf(err, "removing message recipients")
|
|
|
|
qm = bstore.QueryTx[store.Message](tx)
|
|
qm.FilterIDs(removeIDs)
|
|
_, err = qm.Delete()
|
|
xcheckf(err, "removing messages marked for deletion")
|
|
|
|
conf, _ := c.account.Conf()
|
|
if mb.Name != conf.RejectsMailbox {
|
|
err = c.account.Untrain(c.log, remove)
|
|
xcheckf(err, "untraining deleted messages")
|
|
}
|
|
})
|
|
|
|
// Broadcast changes to other connections. We may not have actually removed any
|
|
// messages, so take care not to send an empty update.
|
|
if len(remove) > 0 {
|
|
ouids := make([]store.UID, len(remove))
|
|
for i, m := range remove {
|
|
ouids[i] = m.UID
|
|
}
|
|
changes := []store.Change{store.ChangeRemoveUIDs{MailboxID: c.mailboxID, UIDs: ouids}}
|
|
c.broadcast(changes)
|
|
}
|
|
})
|
|
return remove
|
|
}
|
|
|
|
// Unselect is similar to close in that it closes the currently active mailbox, but
|
|
// it does not remove messages marked for deletion.
|
|
//
|
|
// State: Selected
|
|
func (c *conn) cmdUnselect(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:3667 ../rfc/3691:89
|
|
|
|
// Request syntax: ../rfc/9051:6476 ../rfc/3691:135
|
|
p.xempty()
|
|
|
|
c.unselect()
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Expunge deletes messages marked with \Deleted in the currently selected mailbox.
|
|
// Clients are wiser to use UID EXPUNGE because it allows a UID sequence set to
|
|
// explicitly opt in to removing specific messages.
|
|
//
|
|
// State: Selected
|
|
func (c *conn) cmdExpunge(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:3687 ../rfc/3501:2695
|
|
|
|
// Request syntax: ../rfc/9051:6476 ../rfc/3501:4679
|
|
p.xempty()
|
|
|
|
if c.readonly {
|
|
xuserErrorf("mailbox open in read-only mode")
|
|
}
|
|
|
|
c.cmdxExpunge(tag, cmd, nil)
|
|
}
|
|
|
|
// UID expunge deletes messages marked with \Deleted in the currently selected
|
|
// mailbox if they match a UID sequence set.
|
|
//
|
|
// State: Selected
|
|
func (c *conn) cmdUIDExpunge(tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:4775 ../rfc/4315:75
|
|
|
|
// Request syntax: ../rfc/9051:7125 ../rfc/9051:7129 ../rfc/4315:298
|
|
p.xspace()
|
|
uidSet := p.xnumSet()
|
|
p.xempty()
|
|
|
|
if c.readonly {
|
|
xuserErrorf("mailbox open in read-only mode")
|
|
}
|
|
|
|
c.cmdxExpunge(tag, cmd, &uidSet)
|
|
}
|
|
|
|
// Permanently delete messages for the currently selected/active mailbox. If uidset
|
|
// is not nil, only those UIDs are removed.
|
|
// State: Selected
|
|
func (c *conn) cmdxExpunge(tag, cmd string, uidSet *numSet) {
|
|
// Command: ../rfc/9051:3687 ../rfc/3501:2695
|
|
|
|
remove := c.xexpunge(uidSet, false)
|
|
|
|
defer func() {
|
|
for _, m := range remove {
|
|
p := c.account.MessagePath(m.ID)
|
|
err := os.Remove(p)
|
|
c.xsanity(err, "removing message file for expunge")
|
|
}
|
|
}()
|
|
|
|
// Response syntax: ../rfc/9051:6742 ../rfc/3501:4864
|
|
for _, m := range remove {
|
|
seq := c.xsequence(m.UID)
|
|
c.sequenceRemove(seq, m.UID)
|
|
c.bwritelinef("* %d EXPUNGE", seq)
|
|
}
|
|
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdSearch(tag, cmd string, p *parser) {
|
|
c.cmdxSearch(false, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdUIDSearch(tag, cmd string, p *parser) {
|
|
c.cmdxSearch(true, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdFetch(tag, cmd string, p *parser) {
|
|
c.cmdxFetch(false, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdUIDFetch(tag, cmd string, p *parser) {
|
|
c.cmdxFetch(true, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdStore(tag, cmd string, p *parser) {
|
|
c.cmdxStore(false, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdUIDStore(tag, cmd string, p *parser) {
|
|
c.cmdxStore(true, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdCopy(tag, cmd string, p *parser) {
|
|
c.cmdxCopy(false, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdUIDCopy(tag, cmd string, p *parser) {
|
|
c.cmdxCopy(true, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdMove(tag, cmd string, p *parser) {
|
|
c.cmdxMove(false, tag, cmd, p)
|
|
}
|
|
|
|
// State: Selected
|
|
func (c *conn) cmdUIDMove(tag, cmd string, p *parser) {
|
|
c.cmdxMove(true, tag, cmd, p)
|
|
}
|
|
|
|
func (c *conn) gatherCopyMoveUIDs(isUID bool, nums numSet) ([]store.UID, []any) {
|
|
// Gather uids, then sort so we can return a consistently simple and hard to
|
|
// misinterpret COPYUID/MOVEUID response. It seems safer to have UIDs in ascending
|
|
// order, because requested uid set of 12:10 is equal to 10:12, so if we would just
|
|
// echo whatever the client sends us without reordering, the client can reorder our
|
|
// response and interpret it differently than we intended.
|
|
// ../rfc/9051:5072
|
|
uids := c.xnumSetUIDs(isUID, nums)
|
|
sort.Slice(uids, func(i, j int) bool {
|
|
return uids[i] < uids[j]
|
|
})
|
|
uidargs := make([]any, len(uids))
|
|
for i, uid := range uids {
|
|
uidargs[i] = uid
|
|
}
|
|
return uids, uidargs
|
|
}
|
|
|
|
// Copy copies messages from the currently selected/active mailbox to another named
|
|
// mailbox.
|
|
//
|
|
// State: Selected
|
|
func (c *conn) cmdxCopy(isUID bool, tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:4602 ../rfc/3501:3288
|
|
|
|
// Request syntax: ../rfc/9051:6482 ../rfc/3501:4685
|
|
p.xspace()
|
|
nums := p.xnumSet()
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
p.xempty()
|
|
|
|
name = xcheckmailboxname(name, true)
|
|
|
|
uids, uidargs := c.gatherCopyMoveUIDs(isUID, nums)
|
|
|
|
// Files that were created during the copy. Remove them if the operation fails.
|
|
var createdIDs []int64
|
|
defer func() {
|
|
x := recover()
|
|
if x == nil {
|
|
return
|
|
}
|
|
for _, id := range createdIDs {
|
|
p := c.account.MessagePath(id)
|
|
err := os.Remove(p)
|
|
c.xsanity(err, "cleaning up created file")
|
|
}
|
|
panic(x)
|
|
}()
|
|
|
|
var mbDst store.Mailbox
|
|
var origUIDs, newUIDs []store.UID
|
|
var flags []store.Flags
|
|
|
|
c.account.WithWLock(func() {
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
mbSrc := c.xmailboxID(tx, c.mailboxID) // Validate.
|
|
mbDst = c.xmailbox(tx, name, "TRYCREATE")
|
|
if mbDst.ID == mbSrc.ID {
|
|
xuserErrorf("cannot copy to currently selected mailbox")
|
|
}
|
|
|
|
if len(uidargs) == 0 {
|
|
xuserErrorf("no matching messages to copy")
|
|
}
|
|
|
|
// Reserve the uids in the destination mailbox.
|
|
uidFirst := mbDst.UIDNext
|
|
mbDst.UIDNext += store.UID(len(uidargs))
|
|
err := tx.Update(&mbDst)
|
|
xcheckf(err, "reserve uid in destination mailbox")
|
|
|
|
// Fetch messages from database.
|
|
q := bstore.QueryTx[store.Message](tx)
|
|
q.FilterNonzero(store.Message{MailboxID: c.mailboxID})
|
|
q.FilterEqual("UID", uidargs...)
|
|
xmsgs, err := q.List()
|
|
xcheckf(err, "fetching messages")
|
|
|
|
if len(xmsgs) != len(uidargs) {
|
|
xserverErrorf("uid and message mismatch")
|
|
}
|
|
|
|
msgs := map[store.UID]store.Message{}
|
|
for _, m := range xmsgs {
|
|
msgs[m.UID] = m
|
|
}
|
|
|
|
// Insert new messages into database.
|
|
var origMsgIDs, newMsgIDs []int64
|
|
for i, uid := range uids {
|
|
m, ok := msgs[uid]
|
|
if !ok {
|
|
xuserErrorf("messages changed, could not fetch requested uid")
|
|
}
|
|
origID := m.ID
|
|
origMsgIDs = append(origMsgIDs, origID)
|
|
m.ID = 0
|
|
m.UID = uidFirst + store.UID(i)
|
|
m.MailboxID = mbDst.ID
|
|
m.MailboxOrigID = mbSrc.ID
|
|
err := tx.Insert(&m)
|
|
xcheckf(err, "inserting message")
|
|
msgs[uid] = m
|
|
origUIDs = append(origUIDs, uid)
|
|
newUIDs = append(newUIDs, m.UID)
|
|
newMsgIDs = append(newMsgIDs, m.ID)
|
|
flags = append(flags, m.Flags)
|
|
|
|
qmr := bstore.QueryTx[store.Recipient](tx)
|
|
qmr.FilterNonzero(store.Recipient{MessageID: origID})
|
|
mrs, err := qmr.List()
|
|
xcheckf(err, "listing message recipients")
|
|
for _, mr := range mrs {
|
|
mr.ID = 0
|
|
mr.MessageID = m.ID
|
|
err := tx.Insert(&mr)
|
|
xcheckf(err, "inserting message recipient")
|
|
}
|
|
}
|
|
|
|
// Copy message files to new message ID's.
|
|
for i := range origMsgIDs {
|
|
src := c.account.MessagePath(origMsgIDs[i])
|
|
dst := c.account.MessagePath(newMsgIDs[i])
|
|
os.MkdirAll(filepath.Dir(dst), 0770) // todo optimization: keep track of dirs we already created, don't create them again
|
|
err := c.linkOrCopyFile(dst, src)
|
|
xcheckf(err, "link or copy file %q to %q", src, dst)
|
|
createdIDs = append(createdIDs, newMsgIDs[i])
|
|
}
|
|
|
|
conf, _ := c.account.Conf()
|
|
if mbDst.Name != conf.RejectsMailbox {
|
|
err = c.account.Train(c.log, xmsgs)
|
|
xcheckf(err, "train copied messages")
|
|
}
|
|
})
|
|
|
|
// Broadcast changes to other connections.
|
|
if len(newUIDs) > 0 {
|
|
changes := make([]store.Change, len(newUIDs))
|
|
for i, uid := range newUIDs {
|
|
changes[i] = store.ChangeAddUID{MailboxID: mbDst.ID, UID: uid, Flags: flags[i]}
|
|
}
|
|
c.broadcast(changes)
|
|
}
|
|
})
|
|
|
|
// All good, prevent defer above from cleaning up copied files.
|
|
createdIDs = nil
|
|
|
|
// ../rfc/9051:6881 ../rfc/4315:183
|
|
c.writeresultf("%s OK [COPYUID %d %s %s] copied", tag, mbDst.UIDValidity, compactUIDSet(origUIDs).String(), compactUIDSet(newUIDs).String())
|
|
}
|
|
|
|
func (c *conn) linkOrCopyFile(dst, src string) error {
|
|
// Try hardlink first.
|
|
if err := os.Link(src, dst); err == nil {
|
|
return nil
|
|
}
|
|
|
|
// File system may not support hardlinks, or link would cross file systems. Do a regular file copy.
|
|
sf, err := os.Open(src)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer func() {
|
|
err := sf.Close()
|
|
c.xsanity(err, "closing copied src file")
|
|
}()
|
|
|
|
df, err := os.OpenFile(dst, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0660)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
defer func() {
|
|
if df != nil {
|
|
err = os.Remove(df.Name())
|
|
c.xsanity(err, "removing unfinished dst file")
|
|
err = df.Close()
|
|
c.xsanity(err, "closing unfinished dst file")
|
|
}
|
|
}()
|
|
|
|
if _, err := io.Copy(df, sf); err != nil {
|
|
return err
|
|
}
|
|
if err := df.Close(); err != nil {
|
|
xerr := os.Remove(df.Name())
|
|
c.xsanity(xerr, "removing unfinished dst file")
|
|
df = nil
|
|
return err
|
|
}
|
|
// todo: may need to do a file/dir sync to flush to disk. better to do it once after multiple linkOrCopyFile calls.
|
|
df = nil
|
|
return nil
|
|
}
|
|
|
|
// Move moves messages from the currently selected/active mailbox to a named mailbox.
|
|
//
|
|
// State: Selected
|
|
func (c *conn) cmdxMove(isUID bool, tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:4650 ../rfc/6851:119
|
|
|
|
// Request syntax: ../rfc/6851:320 ../rfc/9051:6744
|
|
p.xspace()
|
|
nums := p.xnumSet()
|
|
p.xspace()
|
|
name := p.xmailbox()
|
|
p.xempty()
|
|
|
|
name = xcheckmailboxname(name, true)
|
|
|
|
if c.readonly {
|
|
xuserErrorf("mailbox open in read-only mode")
|
|
}
|
|
|
|
uids, uidargs := c.gatherCopyMoveUIDs(isUID, nums)
|
|
|
|
var mbDst store.Mailbox
|
|
var changes []store.Change
|
|
var newUIDs []store.UID
|
|
|
|
c.account.WithWLock(func() {
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
c.xmailboxID(tx, c.mailboxID) // Validate.
|
|
mbDst = c.xmailbox(tx, name, "TRYCREATE")
|
|
if mbDst.ID == c.mailboxID {
|
|
xuserErrorf("cannot move to currently selected mailbox")
|
|
}
|
|
|
|
if len(uidargs) == 0 {
|
|
xuserErrorf("no matching messages to move")
|
|
}
|
|
|
|
// Reserve the uids in the destination mailbox.
|
|
uidFirst := mbDst.UIDNext
|
|
uidnext := uidFirst
|
|
mbDst.UIDNext += store.UID(len(uids))
|
|
err := tx.Update(&mbDst)
|
|
xcheckf(err, "reserve uids in destination mailbox")
|
|
|
|
// Update UID and MailboxID in database for messages.
|
|
q := bstore.QueryTx[store.Message](tx)
|
|
q.FilterNonzero(store.Message{MailboxID: c.mailboxID})
|
|
q.FilterEqual("UID", uidargs...)
|
|
q.SortAsc("UID")
|
|
msgs, err := q.List()
|
|
xcheckf(err, "listing messages to move")
|
|
|
|
if len(msgs) != len(uidargs) {
|
|
xserverErrorf("uid and message mismatch")
|
|
}
|
|
|
|
for i := range msgs {
|
|
m := &msgs[i]
|
|
if m.UID != uids[i] {
|
|
xserverErrorf("internal error: got uid %d, expected %d, for index %d", m.UID, uids[i], i)
|
|
}
|
|
m.MailboxID = mbDst.ID
|
|
m.UID = uidnext
|
|
uidnext++
|
|
err := tx.Update(m)
|
|
xcheckf(err, "updating moved message in database")
|
|
}
|
|
|
|
// Prepare broadcast changes to other connections.
|
|
changes = make([]store.Change, 0, 1+len(msgs))
|
|
changes = append(changes, store.ChangeRemoveUIDs{MailboxID: c.mailboxID, UIDs: uids})
|
|
for _, m := range msgs {
|
|
newUIDs = append(newUIDs, m.UID)
|
|
changes = append(changes, store.ChangeAddUID{MailboxID: mbDst.ID, UID: m.UID, Flags: m.Flags})
|
|
}
|
|
})
|
|
|
|
c.broadcast(changes)
|
|
})
|
|
|
|
// ../rfc/9051:4708 ../rfc/6851:254
|
|
// ../rfc/9051:4713
|
|
c.bwritelinef("* OK [COPYUID %d %s %s] moved", mbDst.UIDValidity, compactUIDSet(uids).String(), compactUIDSet(newUIDs).String())
|
|
for i := 0; i < len(uids); i++ {
|
|
seq := c.xsequence(uids[i])
|
|
c.sequenceRemove(seq, uids[i])
|
|
c.bwritelinef("* %d EXPUNGE", seq)
|
|
}
|
|
|
|
c.ok(tag, cmd)
|
|
}
|
|
|
|
// Store sets a full set of flags, or adds/removes specific flags.
|
|
//
|
|
// State: Selected
|
|
func (c *conn) cmdxStore(isUID bool, tag, cmd string, p *parser) {
|
|
// Command: ../rfc/9051:4543 ../rfc/3501:3214
|
|
|
|
// Request syntax: ../rfc/9051:7076 ../rfc/3501:5052
|
|
p.xspace()
|
|
nums := p.xnumSet()
|
|
p.xspace()
|
|
var plus, minus bool
|
|
if p.take("+") {
|
|
plus = true
|
|
} else if p.take("-") {
|
|
minus = true
|
|
}
|
|
p.xtake("FLAGS")
|
|
silent := p.take(".SILENT")
|
|
p.xspace()
|
|
var flagstrs []string
|
|
if p.hasPrefix("(") {
|
|
flagstrs = p.xflagList()
|
|
} else {
|
|
flagstrs = append(flagstrs, p.xflag())
|
|
for p.space() {
|
|
flagstrs = append(flagstrs, p.xflag())
|
|
}
|
|
}
|
|
p.xempty()
|
|
|
|
if c.readonly {
|
|
xuserErrorf("mailbox open in read-only mode")
|
|
}
|
|
|
|
var mask, flags store.Flags
|
|
if plus {
|
|
mask = xparseStoreFlags(flagstrs, false)
|
|
flags = store.FlagsAll
|
|
} else if minus {
|
|
mask = xparseStoreFlags(flagstrs, false)
|
|
flags = store.Flags{}
|
|
} else {
|
|
mask = store.FlagsAll
|
|
flags = xparseStoreFlags(flagstrs, false)
|
|
}
|
|
|
|
updates := store.FlagsQuerySet(mask, flags)
|
|
|
|
var updated []store.Message
|
|
var oflags []store.Flags
|
|
|
|
c.account.WithWLock(func() {
|
|
var mb store.Mailbox
|
|
c.xdbwrite(func(tx *bstore.Tx) {
|
|
mb = c.xmailboxID(tx, c.mailboxID) // Validate.
|
|
|
|
uidargs := c.xnumSetCondition(isUID, nums)
|
|
|
|
if len(uidargs) == 0 {
|
|
return
|
|
}
|
|
|
|
q := bstore.QueryTx[store.Message](tx)
|
|
q.FilterNonzero(store.Message{MailboxID: c.mailboxID})
|
|
q.FilterEqual("UID", uidargs...)
|
|
q.FilterFn(func(m store.Message) bool {
|
|
// We use this filter just to get the pre-update flags...
|
|
oflags = append(oflags, m.Flags)
|
|
return true
|
|
})
|
|
if len(updates) == 0 {
|
|
var err error
|
|
updated, err = q.List()
|
|
xcheckf(err, "listing for flags")
|
|
} else {
|
|
q.Gather(&updated)
|
|
_, err := q.UpdateFields(updates)
|
|
xcheckf(err, "updating flags")
|
|
}
|
|
})
|
|
|
|
conf, _ := c.account.Conf()
|
|
if mb.Name != conf.RejectsMailbox {
|
|
jf, _, err := c.account.OpenJunkFilter(c.log)
|
|
if err == nil {
|
|
defer func() {
|
|
if jf != nil {
|
|
err := jf.Close()
|
|
c.xsanity(err, "closing junkfilter")
|
|
}
|
|
}()
|
|
for i, m := range updated {
|
|
err := c.account.Retrain(c.log, jf, oflags[i], m)
|
|
xcheckf(err, "retraining message")
|
|
}
|
|
err = jf.Close()
|
|
jf = nil
|
|
xcheckf(err, "closing junkfilter")
|
|
} else if !errors.Is(err, store.ErrNoJunkFilter) {
|
|
xcheckf(err, "open junk filter for retraining")
|
|
}
|
|
}
|
|
|
|
// Broadcast changes to other connections.
|
|
changes := make([]store.Change, len(updated))
|
|
for i, m := range updated {
|
|
changes[i] = store.ChangeFlags{MailboxID: m.MailboxID, UID: m.UID, Mask: mask, Flags: m.Flags}
|
|
}
|
|
c.broadcast(changes)
|
|
})
|
|
|
|
for _, m := range updated {
|
|
if !silent {
|
|
// ../rfc/9051:6749 ../rfc/3501:4869
|
|
c.bwritelinef("* %d FETCH (UID %d FLAGS %s)", c.xsequence(m.UID), m.UID, flaglist(m.Flags).pack(c))
|
|
}
|
|
}
|
|
|
|
c.ok(tag, cmd)
|
|
}
|